No icons, banners, wallpapers, manips or any other graphics created from screen caps or promo pics will be accepted as they violate dA's copyright policies. Sorry.
Other than that, anything goes. Except for character bashing. Keep that to yourself, okay?
It'd also be helpful if you submitted your art to the right folder, but don't worry about it if you mess up - I'll fix it. And if there isn't a folder for what you wanna submit, put it in misc and I'll create the folder and move the image in for you.