Ok, at this point I'm almost positive that these do not exist, but this is my absolute last try at finding out.
In 2008, I saw this sort of bad movie called "Rachel Getting Married" (Anne Hathaway, recently out of rehab, gets dramatic at her sister's wedding). While the idea for the movie made me cringe, the actual wedding footage was gorgeous and I SWEAR I saw orange Hydrangeas. They were astounding. They may not have been what I thought they were, because in 2008 I knew even less about plants than I do now, but they looked exactly like Hydrangeas. Is it unheard of to color Hydrangeas orange? Especially for a movie I could see them doing this, but how? With dye? And if so, is it the sort of thing where you put the dye in the plant's water, or would you do dip the petals in it or, or, or... help?
(I actually also just emailed the "greensperson" for that movie to see if she could provide some sort of insight into what I may have seen, I think I just need closure, ha).