Muc, use the Avatar mod, except do not install the mod on the CP where it puts in the Avatar menu.
I have it installed on a board I use. I just removed the CP part and they enter their image. It has to be hosted on the internet somewhere, but it does work.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.