I wouldn't patronize a business that discriminated.

That said, if they find the idea of a same-sex portrait in a floral arrangement offensive to their beliefs, how is refusing to male an arrangement with that different from refusing say one of those "partial birth abortion" scare tactic pics?

Or any number of other pictures that the florist may not want to put into their floral arrangement. The (difficult) issue arises in determining whether the people are being refused standard service because of their orientation, or if they are being refused exceptional service.

Again, if it's too men holding hands then they should make the arrangement, same as they would do with a man and a woman, or likely even two women. But there isn't a hard and fast rule. If they asked for a pic of them in swimwear holding one another, then likely it should be upheld because I'm sure hetero couple could get a picture of the same pose made into a floral arrangement.

Swimwear pic on a rainbow background with rainbow flower arrangements? Personally, I think they should make it, but I can somewhat understand the florist finding it offensive. A flower arrangement is an artistic creation. Should I be able to sue for discrimination if I cannot get (insert artist here) to make a song made entirely of farts and sheep moans?

Again, discrimination isn't alright. If they would do something for a hetero couple then they need to do it for a gay couple. But unfortunately we can't make the situation perfect across boundaries. "No pictures of same sex holding" goes into their offensive category and wham, they're not 'technically' discriminating. Its right up there with a guy trying to convince his girlfriend "its perfectly fair, I can fuck other women and you can fuck other women, completely equal." Of course it isn't equal, but it has just enough logic to be understandable.