Now I don't know which places this will be appropriate because it could deviate attention of normal chatter and because of spam, but here are my ideas.
Instant giveaways:
You would drag an item into chat, and for a fee based on the value of the item, you could set a timer, and have either the first person who would click onto the box (once it appears, it starts out hidden at first and there is a buff or limit of how many times you can do it in Global or something like that.) Or have the app pick a random number, and people would keep clicking until a winner was found. Maybe this could just be done on a holiday?
Saying +i in response to a person:
I don't know how it would be triggered, maybe you would click on their name, and it would work only if they were in global chat or something, and you could give them a small interval of iMG. So a random amount from 0-500, or just a small amount. I guess if you say +i, then a box would pop up, and would somehow select the right person?