I love that! I'd love it over a door! Any color that's bright as a flower would be good, if you're going to place it in the garden. And since it's only paint, you can experiment with different colors until you hit the right one!
I have a couple of horseshoe tables that were given to me by a rancher who made them for us before we left Del Rio, 46 yrs ago. They've been natural, black, and "rust" colored at one time or another. The rust color is from PepBoys, and is used to undercoat car trunks. It looks like rust, but I can use tables inside or out.