It’s a custom frontend panel (and/or standalone webapp) that lets you assign colors (with variations) to your RGB lights – never the same colors again (unless you want to, of course – it just calls the light service in HA, doesn’t mess with your scenes or anything).
There’s a whole bunch of nice-looking palettes included too (including the Commodore 64 palette, if you’re so inclined).
Installation currently requires some manual configuration work, but it’s all in the README on GitHub. If you try it out, I’d love to hear some feedback (either here or on the GitHub issue tracker). There’re probably some bugs, and it’s certainly a bit rough around the edges.