It is very common, to visit one of these pages. The most commonly: pages, which don’t exist any longer, have moved to a new server or have never existed at all. Once you’ve missed your intended destination, you’ll get an internal error message from the server, by default these messages aren’t that helpful.

Off course, you can design server error messages just the way you design any other pages of your website.
It’s not only a more elegant way to deal with errors, but is also extremely useful for keeping users on your web-site, finding new clients or communicating with the old ones.

Our website has the following error page by default, the error page has the same style of the other pages, and the most important thing is that it has menu to guide the users to find our services, works, and all information of our company.

If you see more examples, smashingmagazine has good post with 40 examples of user-friendly 404 error pages.

Also you can see the error working if you enter http://www.cuoma.com/404

Tags: creative, error, friendly, pages