If that offer of making a bird userpic still stands, here's what I'm thinking would be nice:
All three is probably excessive, but the hawk and one of the others might be nice.
- A hawk in flight against a blue sky, with the text "Bright the hawk's flight on the empty sky"
- A cardinal in flight (there are lots of cardinal pictures online, but they all seem to be perched) or
- an egret or a black-crowned night heron either flying overhead or just taking off.
All three is probably excessive, but the hawk and one of the others might be nice.