I know some people who use g̶i̶t̶ ̶g̶a̶r̶d̶e̶n̶e̶r̶ gitfiti to draw on their commit history. Like NES and Atari sprites, like Pacman or Galaga. It's just meant to be a funny subversion of people who take GitHub graphs a little too seriously.

I've never had someone ask about my GitHub and it's on my resume. Probably because it's fairly inactive and I regularly take down projects I'm not proud of.