Resources for KDE Theme Development

I plan to create a KDE theme and was wondering where I might look for some 
good documentation to get me started. Could you please give me a few URLs to 
visit.

Also, since I'm talking with artists here, what do you do when you have a 
concept or 'essence' you want to capture in your work, but don't actually 
have a visual interpretation of it as of yet. ATM I'm thinking I should mess 
about a bit in GIMP until I get something that I feel reflects what I'm 
trying to capture.

And just a third thing. I have tried to subscribe to the gimp mailing lists, 
but when I email my confirm message I get it back 2 days later in a message 
from my email server that it couldn't be delivered.