you could always paint a backing and then Attach to the Tank.
I've painted exterior Blue installation Foam (comes in sheets) easy to cut and water resistant. It can attach easily with some tape. (light and durable)
This way if you want to change colors, just repaint the background.
I would use a latex or Water based on the Foam....benefit to this is low odor plus no damage to the Foam.
60 gallon(Parrots and Convicts) 55 gallon African Cichlids 5 gallon Betta tank 35 Gallon Hex (Bolivian Rams, Oto cats, Bloodfin Tetra and a shoal of Tiger Barbs) 75 Gallon Oscar Condo. 30 gallon GBRs & Danios