Make shitter-glitter pills and POOP RAINBOWS!

Ah yes. This is one of those "projects" that just kinda happened. It's the very dubious concept of eating a capsule of glitter to see if it makes your poop all spangly. (Like a Unicorn's.)
It involves getting some gelatine capsules and glitter from a random ebay seller and then filling the gelatine capsules with the glitter to make it easier to ingest.
I have now actually tested one, and after taking a surprisingly long amount of time to work its way through my system my stools were indeed modestly spangled, albeit that they also came out with a rather "angry" texture that may have been down to the relative coarseness of the Rosco 1/64th" glitter. I think I'd recommend the smaller 0.008" (1/128th") glitter as a more butt-friendly alternative. (I shall of course test that too!)
Standard glitter is generally classed as non-toxic due to being aimed at kiddy crafts and the fact it's really just tiny bits of metallised plastic. Indeed some of the cake-glitters are just very fine plastic glitter. I'd suggest that if you are actually going to ingest glitter, that you choose the finest you can find to minimise any annoyance to your intestines.
The end result is amusing, but not particularly dramatic. Your poop will come out interspersed with glitter, but only the stuff near the surface will be visible due to the rather poor optical qualities of standard poop. (High opacity with dark pigmentation.)

As with anything like this, you try it entirely at your own risk.

If you do try it then feel free to post an analysis of your results in the comments below.