Like the palette addition, good touch.
One small problem I found - you don't accept 000000 as a valid hex code.
A suggestion as well, although it might take a fair bit of work - you could use javascript to automatically update the menu on the page as each option is changed, saving submitting to see how each change would look. It would be pretty simple, although maybe a little time consuming to do it for each option! You could also quite easily have the actual CSS update via javascript as well, just leaving the button there for people who have JS disabled.
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