Peeps are changing their avatars on Twitter to show solidarity with Iranians by throwing a green gloss over them, which makes everyone look like they're caught with a night vision camera.
Here's the one stop-shop which will do that for you.
Instead you might want to pick from the following!
Having attended a very stylish demonstration opposite the Iranian Embassy this evening, taking the trouble with your avatar seems to me to be entirely at one with the Iranian opposition!
All new content on my restarted blog is here