Here are some brick tiles I made for the dungeon game I'm thinking about making.  These tiles are quite versitile and can be used for a platformer, RPG, or top-down shooter.  If you use these, you don't have to give credit, but it would be appreciated if you did.  I'd love to see what you make with these, so if you use them, please send me a link to your project. :)

Dungeon Slime: http://opengameart.org/content/2d-slime-animated

Dungeon Spider: http://opengameart.org/content/2d-spider-animated