If you're gamifying bringing people into steem.... maybe you could use them as a reward for any of the following:
- Accounts claimed and given away
- new accounts delegated to.
- new people you've brought in and who have powered up to a certain level
- I guess you could accept an intro post mentioning accounts for those accounts which don't have enough SP to create their own accounts.
I wouldn't be surprised if you link them to charitable donations made through steem as well!
Gotta have yer own token!