before.. (nothing accept for incredibles sheet covering the bare 2"x4" wall in my basement)
after..
this is what the back looks like
the extra paint.. I bought 5 and only needed 2..
this is the second tank I did this on. I got a pack of 6 sponge paint brushes for $1 and the paint is $.44 per bottle, they have any color you want and it takes no time to paint the tank at all. So much easier than having to take your tank outside, tape everything off and spray paint it, not to mention this stuff is probably 100x easier to take off than spray paint. I did both of my tanks while they were already set up too. The only bad thing about this is you have to wait for it to completely dry to put another coat on it but that only takes about 20minutes or less if you have a fan on it. 2-3 coats should be more than enough. I haven't had any flaking or chipping on the first tank I did, I've even gotten it wet and it didn't effect it. If I were you and looking for a cheap background I'd try this, the most it should cost you is $3-4 and a half hours worth of work. I'm pretty sure this is the kind of paint that party stores paint their windows with.
I think I'm going to buy 3-4 bottles of different colors and try painting something cool on my tank, I'll let you know how it turns out. I'm assuming if I paint 1 color on and wait for it to dry I can paint over it without having it mix the colors. Maybe I can get some sponges with shapes on them and paint them all over a tank then go over it with black or something.