Looking for ideas

[gypsy]

I am an Asexual ally, and my uncle and his boyfriend are getting married. I already have an idea for a gift for them. I'm thinking of making them a picture frame out of plastic canvas. I'd put their names on it across the bottom in black, six hearts (red, orange, yellow, green, blue, and purple) across the top...and those are kind of the only ideas I've had for how I want it to look. Are there any particular designs, symbols, or colors that are particularly meaningful to the gay community besides the rainbow?