These are the ones I've used to date. As you can see, there's a bit of a theme going - I initially planned to change the avatar to reflect my mood - sunny for happy, cloudy/rainy if I was down/annoyed etc, but this proved too much like hard work, and I tend to muddle along in a kind of half happy/half grumpy kind of mood anyway, so the current one stuck.
I used the full sun one when I was trying to will good weather for the London picnic (it worked!) and the thunder cloud for when I had a huge week long fall out with my girlfriend (now fully patched up).
I used the full sun one when I was trying to will good weather for the London picnic (it worked!) and the thunder cloud for when I had a huge week long fall out with my girlfriend (now fully patched up).