ThemeForest - Boxxy 404 Page - RIP | 1,16 MB
Boxxy is simple and nice looking error page in style of cardboard box. Easy to customize (text, error, links). You will be able to search and go to some links. Simple and effective.
DEMO:
http://themeforest.net/item/boxxy-404-page/4452180?WT.ac=new_item&WT.seg_1=new_item&WT.z_author=otakuf