I was browsing and found this:
It's brightly colored crayola sand! Personally, I like "natural" looking, but I found this to be really cool. It's cheaper than aquarium sand, but a little more pricey than play sand.
I have no idea how they dye it.. I think we should look into that first before buying it for our bettas!
I just might have to try this, just for the fun of it!