You'll need an image editor, like GIMP (it's free) or Photoshop.

You can find cover templates and resources at BigFatRock's DVD Covers.
[i] (Password - BigFatRock (capital and lowercase letters matter).
Search - browser Ctrl + F or use index.txt file) [/i]

Read his post in the previous page of this thread

Cabernet (updated version. changed the back layout and dev logo)
Dino Crisis BUNDLE
The Glitch Fairy

DVDCovers updated

- added few covers from RenKalan
- added covers from kakiss4
- added sources how to create covers by RenKalan (GOG_creation folder)
- added The Chronicles Of Riddick Escape From Butcher Bay