rach, your post reminds of a funny story. in 1991 i was living in philly, in west philly actually, and the crack epedemic was full blown. all the streets in my neigborhood were littered with empty plastic vials. the vials were octagon shaped i think, they looked like pieces of a bic pen. anyway, the came with a rock in them and a colored cap to seal the vial.
one day i was in a park and i saw a white guy picking up the vials and the caps. i asked him what he was doing and he showed me that he had hundreds of these caps , in a variety of colors. he explained that he was using them to make a mosaic of hitler's face that he was going to present to the chief of police in philadelphia. unfortunately, i never got to see this masterpiece, although i heard that he did finish it and tried to give it to the chief while the chief was presenting a public speach. i think the artist might have been arrested. it was pretty funny at the time.