I like to hide my Desktop icons, specially when I'm going to present a keynote.
This is a very simple workflow that executes a shell command to toggle the Desktop icon. I Hope someone else find it useful.
Just use the keyword deskicons.
Download Link: http://cl.ly/OEG8
If it's not working properly (no change, or icons reappearing in a few seconds) try executing the following command in the terminal:
defaults write com.apple.finder CreateDesktop 1
After that it should work fine.