If you haven't used something like THIS - you should check them out. I picked ours up at Target a few weeks ago and they were like $5-6.00.
Gabe LOVES having colored baths and it's funny to hear his requests. The YELLOW baths are kind of gross because it looks like they're taking a bath in the toilet....
Anyway - they're great because they don't turn the kids skin or the tub colors. And it makes baths just a little more fun. (Although - if you'd seen the splashing mess the boys made tonight - you'd wonder if we need 'more fun' at our house during bathtime)
(And when I was taking these pictures Gabe got all worried. He said, "Mom - I need to cover up my bum!" Even though I reassured him that I'd take decent pictures it still concerned him, and he covered up with a washcloth. Silly kid)