Avatar: It is the three birds from the end credits of 'The Mysterious Cities Of Gold', an early 90's childrens cartoon. The full (home-made) .gif is here http://xs129.xs.to/xs129/08296/birdsop3518.gif , but it is too big for these forums, and I am a noob at making gifs so I couldn't figure how to make it smaller.
I find that it is a relatively peaceful image, and helps calm trolls on some forums (not saying these ones ;) )

Handle: My handle seems to be different all over the place. I like to use different adjectives for light, so: Fleck, Mote, Spangle, Dapple, Haze, Glow, Glimmer, etc, but these are usually taken when I try them, so Flek or Flekkie has been useful. I find that people treat me less aggressively if I use Flekkie over Flek, probably because it sounds more affectionate.