Go to the options menu and give your hominid the indicated name to get the following unlockables:
Unlock Tom Fulp Hair: tomfulp
Unlock Blonde Hair: Cletus
Unlock Red Hair: April
Unlock Jheri Curl Hair: Superfly
Unlock Pirate bandana: Goodman
Unlock Top Hat: Grrl
Unlock Diamond Tiara: Abe
Unlock Daisy Headdress: Princess
Unlock Dick Tracy Hat: Dandy