A colour palette card (there are probably lots of them out there?!) It's also a LGBT card, or LGBTQ card.
It was really simple making this one. I just cut out different sized circles in different colours. Some circles are made of embossed paper, which I have ordered through Etsy. The heart was found in a magazine of some sort, but you could probably find fancier rainbowy hearts out there on the internet. Or make one. :)