midnight: That's another hard one haha. I have so many, but I'll try to slim it down. Resident Evil 3, Harvest Moon: Back to Nature, Grand Theft Auto: Vice City, Legend of Mana, The Darkness and Bioshock. And you can bet I'm missing tons!
Crescent: I'm used to Photoshop so I found it a little confusing actually xD But I've seen some amazing stuff made via GIMP and for free - you can't beat that