Salve Druse!
You probably have a specific avatar that you want to use, but if not, and if you are looking for just the right one, go to
http://www.vroma.org and browse the image archive. Then all you'll have to do is resize whatever you want, I suppose, although I, too, have had a mite of avatar trouble!
Nevertheless, I'll be trying again. The images at vroma are available for use. Just read the use policy.
Happy avatar hunting.
Vale,