A few nice 50 cent images I found:

50 cents per Karl

Image by massdistraction
Karl the Pencil Monkey and other toys can be found at Heavenly Soles in Minneapolis (I spend more money there on toys than on shoes).

4 GANGSTA RAPPER -50 CENT- THE BULLETPROOF

Image by The PIX-JOCKEY (visual fantasist)
Based on "The Face of War" by Salvador Dalì (per la serie LE PIÙ GROSSE TESTE DI… RAP)

Irish 50 Cent Coin

Image by DavidDennisPhotos.com
I took this macro shot of the back of the Irish Euro 50 cent coin while drinking my Guinness in the pub.