Trophies from my victims?
Beds for all my cats?
Progressively larger dildoes?
An Escher optical illusion puzzle?
Jars containing the souls of all the lost Anandtech posters in the Politics and News forum?
Iguanas. You can never have too many.
Gummy Bears sorted by racial profiling.
420 strains of pot
The heads of all those who made unwelcome sexual advances.
OJ Simpson's Gloves
Bill Cosby's Balls
N. Korean intestinal worms
Hillary's emails, printed out
Trump's balls (would surely fill all shelves)
Leave them empty and claim it's a social statement.