[jkjeldgaard]

I don't think there is a wealth of FOSS programs when in comes to designing. Hence, I tend to use of various web-apps for design tasks:

http://layerstyles.org/ - Css generator

http://0to255.com/ - Color/gradient chooser

http://coding.smashingmagazine.com/2011/06/10/useful-html-cs... - Link collection