I just had my tank painted black, I went the a Sears Hardware store picked up some black and White checkered contact paper and put it on the tank inserts and across the back of the tank. I works great. I was a toss up between the checkered or clear contact paper. The first picture in my gallery, you can kinda see what I did.
Total cost was about $3 and about 1 hour to apply it. Hair dryer helped with applying it to get around the curves.