
By Default Blogger shows Error page message in a box and its not look Style.
Here I am saying about how to Customize it much better...
Only Custom message [No Style]
If you want to show only a custom message then First Go to updated Blogger InterfaceThen Go to Setting->Search Preferences

Error Message with Stylish 404 images
If you want Colorful Stylish 404 page do the following.- Go to Design->Edit HTML
- Find </head> and copy the below code just above it.
<b:if cond='data:blog.pageType == "error_page"'>
<style type="text/css">.status-msg-wrap{font-size:100%;margin:none;position:static;width:100%}.status-msg-border{display:none}.status-msg-body{padding:none;position:static;text-align:inherit;width:100%;z-index:auto}.status-msg-wrap a{padding:none;text-decoration:inherit}</style>
</b:if>
<style type="text/css">.status-msg-wrap{font-size:100%;margin:none;position:static;width:100%}.status-msg-border{display:none}.status-msg-body{padding:none;position:static;text-align:inherit;width:100%;z-index:auto}.status-msg-wrap a{padding:none;text-decoration:inherit}</style>
</b:if>
- Save the Template
Error Page Style 1

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIevj4ia-Ga2E3WB9xnQ_zXdTPsxnP-ybRIpKarzmqypVnRfcDk0Ska-YpvLau_pvlhmUkZTV0D7u2HPycIvUI2WqhARwia-QhyphenhyphenWT-n03sFQhXt9cnfj6kBm9xAAIWtnhNUiVrwjRARTU/s1600/404+error+page+1.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIevj4ia-Ga2E3WB9xnQ_zXdTPsxnP-ybRIpKarzmqypVnRfcDk0Ska-YpvLau_pvlhmUkZTV0D7u2HPycIvUI2WqhARwia-QhyphenhyphenWT-n03sFQhXt9cnfj6kBm9xAAIWtnhNUiVrwjRARTU/s1600/404+error+page+1.jpg"/>
Error Page Style 2

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaq0dfwNvk5G5BPvlJBeWB1Sm5nW-kmSnrWIB4ISW7P6C1Te6frKbtRn_5wh1XUr2BRFPQ_716yzrAuCcEkvLpYx1Cc_zvy-Zu-dDMujrWrfonvXlJfaswzempbFkn8wBeYA4Nhq-LQIY/s1600/404+error+page+2.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaq0dfwNvk5G5BPvlJBeWB1Sm5nW-kmSnrWIB4ISW7P6C1Te6frKbtRn_5wh1XUr2BRFPQ_716yzrAuCcEkvLpYx1Cc_zvy-Zu-dDMujrWrfonvXlJfaswzempbFkn8wBeYA4Nhq-LQIY/s1600/404+error+page+2.jpg"/>
Error Page Style 3

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTmTv2CJk80c0c1m3uYoTAW5n9BjCjNqCpmxzVfWUHom3ZoTwlPo-5_ZoeQ1hT0QHNQUYdsrAXj-tqqvpXQzlJ5zzWGNItOBSd_OqE7dQNXgCYgtraLLezzs_JLp5RJ-SUNsZWgq0sM3I/s1600/404+error+page+4.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTmTv2CJk80c0c1m3uYoTAW5n9BjCjNqCpmxzVfWUHom3ZoTwlPo-5_ZoeQ1hT0QHNQUYdsrAXj-tqqvpXQzlJ5zzWGNItOBSd_OqE7dQNXgCYgtraLLezzs_JLp5RJ-SUNsZWgq0sM3I/s1600/404+error+page+4.jpg"/>
Error Page Style 4

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4UFCdXYzvndr9JN-VrTM6RhURvbDRdH5G59otq1HztW8P0ktIc9gAT1JYQwa8u8f9dZ8SXaBCXEc7Monp87eEpCsFV26opCgKzS9vxfODS9_0PxNQfeH7ANlyn-sKhIsywJ1t_CGa0kA/s320/404+error+page+6.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4UFCdXYzvndr9JN-VrTM6RhURvbDRdH5G59otq1HztW8P0ktIc9gAT1JYQwa8u8f9dZ8SXaBCXEc7Monp87eEpCsFV26opCgKzS9vxfODS9_0PxNQfeH7ANlyn-sKhIsywJ1t_CGa0kA/s320/404+error+page+6.jpg"/>
Error Page Style 5

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3W_XBQHc1gkzPRdLnwtHawpXKG4_0p5PNVuSsUDxVmSSt353vt9m82sCOli5MubwpQWd8JJOMzDpfWJXo5ZSUD5jVuzv0cXzbxg0Xgcc75bUiM_XE-6mf2vpUUSUJ7bc8BTgpKogq5AE/s1600/404+error+page+7.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3W_XBQHc1gkzPRdLnwtHawpXKG4_0p5PNVuSsUDxVmSSt353vt9m82sCOli5MubwpQWd8JJOMzDpfWJXo5ZSUD5jVuzv0cXzbxg0Xgcc75bUiM_XE-6mf2vpUUSUJ7bc8BTgpKogq5AE/s1600/404+error+page+7.jpg"/>
Error Page Style 6

- Go to Setting->Search Preferences
- Copy below code in Custom Page Not Found section [as shown in fig. first]
<h2 style="font-size: 35px;margin: 0;text-align: center;">Oops..! </h2>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj55D2upbU1NiQZTa5GkuSQgpRehwLA362o9y1OenyWBTprim8zMXa45tK0XY5FKONfvFt-ObWPKD5vjoLdYK_BUYcEKcJUV74_kSO_huJP8r9iDwGBLpOpLMcQYQLgD0JynyOh3rnGjTE/s1600/404+error+page+3.jpg"/>
<h3 style="font-size:17px;">Sorry,You are trying to reach an invalid page...!<br><a href="/">Click here</a> to go to Homepage <br> Have a nice Day...</h3><img src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj55D2upbU1NiQZTa5GkuSQgpRehwLA362o9y1OenyWBTprim8zMXa45tK0XY5FKONfvFt-ObWPKD5vjoLdYK_BUYcEKcJUV74_kSO_huJP8r9iDwGBLpOpLMcQYQLgD0JynyOh3rnGjTE/s1600/404+error+page+3.jpg"/>
Then Click Save..That all..
First thanks to Bloggerplugins.com for the custom error page code, visit here. Then i made some changes and add beautiful 404 images that i was inspired from HongKiat .
I thinks this article helped you..If any bugs of doubts don't hesitate to ask..do comment...
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