Thanks, actually I don't know what I was thinking when I made them green. It's like in a cave or something, so there really is no light source. Maybe just some light from the entrance. I was looking at the pixel art tutorial "So you want to be a pixel artist?" and when they talk about tiles like these, it said make the tiles darker. either that or I don't understand it.
The light green pixels are supposed to give it "depth" or something, so I don't really know what to do there. I want the tiles to have a mossy look, like it's old. Any suggestions?
Also, I was thinking about putting these for free on opengameart.org so other people could use them. But not until I get it right. This is just to sort of learn pixel art.