Where can I get a cool Troll avatar?

Answer 1

Look up collectible troll dolls on eBay, and right-click on the photo you like best. Most of them are jpeg files you can copy with ease. In the alternative, try searching for the Arthur Rackham illustration for fairy tales that involves a troll. I remember having seen one. Rackham was an illustrator in Victorian times, I believe. Anyway, long ago enough that his paintings are in the public domain.