Rainboh

'Rainboh was the homeplanet of the Jeby. It had a rocky surface which had many colors, appearing as if it was a rainbow from space. The rain itself was multicolored and made the sky look like a rainbow too.

Behind the scenes
Rainboh was created by Paul Rice, a Star Wars fan, for the backstory of their Jeby entry in the Design An Alien contest held in the Star Wars Galaxy Magazines and as such, exactly how canon the planet is remains unclear.