Okay—these are pretty much done at this point. I don't want to add too many more schemes because I doubt anyone will use them, but if you have a really great test-of-time–standing idea it's always welcome.

Also, post here if you have any other comments or questions about the appearance and layout of forum posts. (I have a number of outstanding issues already, such as merging the template with the one used for comments elsewhere on the site, and fixing the post offset when jumping into a long thread with multiple unread posts.)