As I said yesterday, I'm going to be Guest of Honour at this year's Readercon, July 9-12, Burlington MA.
If you donate $250 to the Readercon Indiegogo campaign to raise money for a convention sound system, I will use the name of your choice (yours or someone else who has given permission) as a character in my next published fiction. If you're willing to wait a while, that will be Menewood (the working title of Hild II). Otherwise probably the character will appear in a novella I'm thinking about.
There's only one, and this will be the last time I offer this particular perk for any cause, no matter how worthy.
ETA: My wee offering is taken. But go get something else: a manuscript critique, a monster, a mug...