It should also be able to use the rescaling system xenforo seems to be using to fit avatars I think, incase people upload an image larger than would be ideal. Basically this is a replacement for normal signatures as I find that they become obnoxious after a while and clash with things like the post ratings mod.
I'd also like to maybe see if the user card avatar could be "fitted" to the frame like we see with the sidebar display, but I would consider that a bonus.
Here's an example image for the signatures with the right resolution & proportions:
I'll pay anything from 20-35 dollars for this.