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

Frostpunk 2
The Plucky Squire
EDENGATE: The Edge of Life

Beyond the Ice Palace II
Beyond the Ice Palace II_2
Silent Hill 2
The Bridge

Fort Solis
Red Faction Guerrilla Remarstered
Harold Halibut

DVD Covers updated
Password - my nickname (capital and lowercase letters matter)

Elroy and the Aliens
Elroy and the Aliens (alt)
Crow Country
Crow Country (alt)