There are many reasons why your websites needs a 404 error page. You might have moved some pages, or changed your URL structure, and now any links going to those pages no longer work.
Web servers provide your website with a default 404 error page, but this is usually a very simple, boring page which usually results in visitors leaving your website.
Many web designers take the time to build a custom 404 page, that helps keep visitors on your website, perhaps suggesting alternative content or simply keeping them amused in the face of an error.
Below you’ll find a collection of 50 unusual and innovative 404 error pages.
Acromediainc
Amorphia-apparel
Berganblue
Bluedaniel
Bol
Catalyststudios
Chrisglass
Chrisjennings
Clubpenguin
Dawdle
Duoh
Eternalmoon
Ferdaze
Frywiles
Fudgegraphics
Fuelly
Gog
Habrahabr
Henrikhedegaard
Hornets247
Inspiredology
Instantshift
istockphoto
Jaiku
jimcromwell
Justcreativedesign
kochatelier
Lightpostcreative
Mailchimp
Mixx
Onextrapixel
Patterntap
Plinko
Project-euh
Redbilby
Retardzone
Robo
Rubberducky
Sickdesigner
Slonky
Studentmarket
Surfingonstatic
Suspendedanimations
Tattoosales
Tele2
Thebrand surgery
Tinsanity
Warhammeronline
Xero-g
24-7media
I can see other sympatic 404 page in a IKEA’s online comunity from Spain:
http://www.elhogar.de/inicios