Fill them with stool samples you extract from the chicks you abduct and put in your enema session room for some after-hours torture. Collect them in a shelf hidden behind your refrigerator or wherever else is room. Labels with photos of your victims with a short summary of their stats, like ethnicity, measurements and so on, are a bonus. PM tritone and find out if he wants to know if the shit of white chicks looks different than the one of black ones. Report back annually with a head count. Happy collecting.