How do I get my picture to appear in message threads? In the stock messaging app, the contact I'm messaging has their picture next to their replies, but mine is just a grey box; how do I get my picture there? I have a contact called 'me' with my picture and phone number, but it's not making the link.

I'm running Gingerbread 2.3.4 on Nexus S.
Assuming the answer to my comment above is Talk, you need to change your picture in your Google Account.  This is most easily done through Gmail's settings on a PC.

If you sync your contacts from Gmail, that picture might possibly show up in your SMS app as well.