Feature Request: Custom themes.

[teej1469]

Allowing the user to add their own custom themes by changing colours of elements in the app, or even allowing for custom css for more advanced users would a great way to allow users the ability to match Session's aesthetic to a custom designed Linux DE for example.
I'm not familiar with programming front-end design, so I can't gauge the difficulty of adding such a theme, but I would love to see something like this!