I used to snicker behind my hand at my cousin, who told horror stories about his adorable son's habit of finger painting with his own poop. I say USED TO because, well, TT3 has graciously inducted us into the AA of poo-painters. Oh JOY.
It's not enough for him to just dip a finger in and smear, oh no. He basically shoves his entire hand down the back of the dang diaper to catch the poop as it exits, then proudly displays his crap-glove before smooshing it on all vertical and horizontal surfaces within reach, including his entire body.
But, as D pointed out, it could be worse - he could be eating it (I just puked in my mouth a little).
All I really have to say on the subject is, thank God poop washes out! of pretty much everything.