For 4 bucks, this stuff has made a better background than any laminated paper ever could. Thanks for the advice. I would have never guessed you could spray-paint glass. I've posted a few photos of the process.
Just make sure your tape is smoothed down hard against the plastic frame. I had a few speckles of paint sneak through (no biggie at all- but for the anal retentive, I thought I would address this
). And if you aquarium is a bowfront, put a couple pillows under it for safety/stability.