This follows
jordan179's idea of starting off with the real Io - I've simply deepened the existing greens and added more, in several stages to give it a really virulent look. At the sort of size I want to use it ought to look pretty good.
This is my version

and this is the original

no subject
Date: 2009-09-26 04:11 am (UTC)http://img.photobucket.com/albums/v176/Nelsie/Sci-fi/Green_Io_240px.jpg
Or large version:
http://img.photobucket.com/albums/v176/Nelsie/Sci-fi/Green_Io.jpg
no subject
Date: 2009-09-26 04:15 pm (UTC)