Geek on!

[willmate]

Peta: I don't have a green icon
Will: I don't have a yellow icon
Peta: No, silly, an eco icon
Will: Oh right
Will: I wonder if it would be quicker to use Paint or ImageMagick to create a green icon?

Will realises he has a Mac - so Paint is not an option

2 mins on google and www.imagemagick.org later...

convert -size 100x100 xc:green green_lj.gif