Editing 'Greek Yoghurt'
PermalinkMany Thanks

(remember to copy the theme up a level so your mods don't get overwritten when you do upgrades)
Dashboard->Themes->(select theme)->Customize
You can also use my Style Quickie block to do similar stuff with LESS. On my own c5magic site (http://www.c5magic.co.uk ) I used it to apply a gradient background (and more).
@medium: #5B83AD; @lighter: @medium + #333; body,html{ background-color:none; .gradientBar(@lighter, @medium); }
http://www.concrete5.org/marketplace/addons/style-quickie/...