Haha that works too! If the bottom is your tank is bare, I suggest you tape some paper or something underneath on the outside bottom panel so the fish don't see a light from underneath which really bothers them. Do this until you decide to put gravel in, empty the tank and paint it then put the fish in, or if you just like the look!
Lots of people paint the bottom of their tank. But make sure it is the outside part, not the part that comes in contact with water.