Frendovalya, I couldn't have said it better myself...  However, what he's looking for is very hard to find, and even then, when he did find it the model probably wouldn't be animated and animation takes some time if you want it to look good.  My best advice to the guy is to just go get some 2D sprites and change then significantly to the point that you don't recognize the old sprite, you know? Forget about 3D Sprites with a deadline.  As for the games backgrounds, you can go with 3D rendered levels, it works great for a game I'm working on, I'll add a pic in case you want to see what it will look like if you really take your time even if there is a deadline.