Each time you vote for a Category, you will receive a random prize from the Neopies Prize Pool. It consists of many prizes, but once you receive a certain kind, you should not receive it again, so you don't have to worry about repeat prizes. If you are a Premium subscriber, you will also receive an extra prize for each vote from the Premium Neopies Prize Pool. This prize pool consists of only 27 items, so while which prize you get per vote will be random, if you vote for each category, you are guaranteed to get all prizes from within!