Colorful headers

[ghost]

I'd love to see every instance of pump.io using a randomly chosen preset of background color. Having the default black top-bar isn't only dull, but also hides the decentralised nature of pump.io too much.

it is just two hex colors in css!

(the blue can be red, gray, green, white, whatever)

[evanp]

This is probably more related to #547. But I'm going to make it a deployment issue, when we have themes, to have different themes for the different "default" sites.