Oh, I hadn't thought of using Lunar Heralds in place of Shimmer-scales... The Rosebud's father is actually a Bronze Shimmer-scale (it's hard to tell in lineage view), but I bet a Bronze LH would work, too. I like the brown Copper because the roundness complements the round Shimmer, but the Lunar Herald's shape goes well, too. I might have to try breeding one and compare.

And, hm, the Golden Wyvern x Arsani looks nice, too. I can't decide between that and the Gold! If you don't mind, I'll take the GW egg and decide once I have two checkers to compare.

Thanks for the ideas!