Firstly - Love the idea of your plugin and I would really love to use it!
The problem is that it DID work, however it changed the title colour of one of my published posts when I previewed and tested your plugin.
I had a WP.org set up through GoDaddy and I can only install plugins from the plugins page in my dash (I don't have a wp-content/plugin - or whatever it's refered to as - folder as WP wasn't downloaded manually). And I am only able to download your 1.0 version - if that has anything to do with the issue.
The colour picker is perfect for the posts, but the layout for the page options are a bit all over the place.
You've got a great plugin here and I'd love to see it updated. It would be great if you could fix it.
Thanks in advance (provided you do it!!!),