There's not yet full CSS customization for user profiles. It's the colors and the "piece of flair," which is the design around the user icon. On the bright side, it's easier and faster than writing a lot of CSS!
Ohhh! That's what was confusing me! The icon flair!
I saw someone with it and was super confused when I couldn't figure out how!
Looks like you've got it now! I LOVE those berries. They go with your hair.