OpenBuilds BlackBox has an onboard RGB LED: If your machine has a theme / specific color preference, you can use the solder-jumpers to the right of the RGB LED to configure a custom backlight color for the logo on the top panel:

Use an Exacto knife to cut the bridge between the pads of a solder jumper to remove that color from the mix, or close the solder jumpers with a drop of solder to add a color back to the mix.

For example, if you want a RED backlight, simply slice the bridge for GREEN and BLUE. If you want Purple/Pink, Slice the GREEN jumper and close the RED and BLUE jumpers