Userstyle in more colour schemes

[turlough]

I've finally done something I've been thinking of doing forever but never actually getting round to. I've made more colour schemes for my brown & tan Pinboard userstyle. The style is now also available in blue, green, purple, and red.

Please let me know if you have any problems with these or if anything isn't working properly. I've done my best but proof reading CSS is always tricky.