-I like the free sigs/avatars idea
-I also think custom titles that members can don for a period of time would be cool, provided that they remain PG-13 (ex. "the cool gem" or "professional beach hunk" or stuff like that)
-Something collectible, like little virtual stickers or stamps that go into some sort of collection/gallery on each profile.
-Site-wide prizes! Events or rewards for the entire site that are worked towards by the contributions of many members over time.
-This may play into the site-wide prizes thing, but comics or fanfictions of some sort, whose chapters are unlocked by a certain number of Pearl Points.
-Some sort of textual or even virtual (if we have programmers on here) game that requires Pearl Points to play or get rewards in
-This isn't a prize, but a suggestion: maybe members could EARN Pearl Points by doing something to contribute to the rewards/prizes available in the Pearl Prize Pouch. It would ensure that we don't run out of rewards as quickly *shrugs*
(and if you need any help with making certain prizes, especially those of an artistic sort, I'd be more than willing to assist in the process