Bright Orange Cactus
Singapore Plants Lover has some delicate photos of a very bright orange irradiated Gymnocalycium graft. They seem to be very popular, and I understand they’re even more popular in Asia.
I find them to be unpleasant. Here’s a wikipedia photo to get you started, but go ahead and click through to the Singapore photos, too.
That looks like it’s been grafted onto a Hylocereus base. I wonder if the base can still produce delicious dragon fruit when grafted like that?