At the time of writing this, I had 50 user pics uploaded. It will doubtless surprise nobody who knows me well to learn that over half of these feature either Buffy, Willow, Faith/Echo or River/Cameron. I do have one or two uploaded of various other Buffy characters - Spike, Angel, Xander, Satsu, Kennedy, etc. However, there are also some huge gaps; important characters I don't have any icons of.
I decided to remedy that. I've made a couple of dozen user pics from the episodes 'The Initiative' and 'Unleashed', plus a few extra ones. So now I can have appropriate icons even if the conversation is about Giles, Riley, Maggie, Forrest, Fred, Lorne, Gunn, Wesley, Nina, Harmony, Eve, Illyria, Cordelia or Dawn. :-)
Feel free to take any of these for yourself if you want to.