here's some BRIGHT GREEN crap for ya...

Poop REport: Dye colors your pool

And GREEN crap comes from drinking PURPLE kool-aid.

no shit! scientifically proven.

and from some of the thousand comments...

poo party (not verified) -- 08.07.2007
"i didnt read all through the comments. there are too many. i used to work at tcby and we found that if you eat a lot of rainbow swirl, which is vanilla with lots of different food coloring, you will pee blue. it is pretty much awesome. we never had any reports of blue poo. we tried. we ate an entire cake of it. we were definitely all pissin blue. but no blue poo. that would be freaky. green, you've heard of. brown and blacks, the common...but blue? only martians!"