Purple is my favorite color, so it reminds me of happy, but it also makes me think of a purple hippo monster with yellow spots and a straw hat.
Purple reminds me of these crystaline shapes I saw while staring in to a purple glow stick tripping on acid!
My grandfather used to mix banana and vanilla pudding, and coloured it with purple sugar crystals which made the whole pudding purple, that's what I think of.