StakQuil Headcanon: Peter brings home Tony lots of space rocks and Tony uses the rocks as inspiration for the paint jobs on his bots, and names stuff after the rocks. He also collects them, and loves his space rocks a lot.
Oh my gosh, this is so cute! He even finally builds a cosmic armor in the color scheme of the first rock Peter ever brought him, and sure it’s Mark XX on the blueprints, but Tony likely names it after the stone (or Quill!), and they go on to have awesome adventures in space for a few good years.
Like imagine though that some of them are hideous? Like this one that’s puce and mauve colored, and huge, and sparkly, and Peter gave it to him with those puppy dog eyes that he’s actually not good at??? Tony’s the only one who can’t resist??
So but Tony builds Peter like a souped up jukebox in those colors, and its such an eyesore, like Tony coated it in glitter so it would match the hideous rock but no matter how much Rocket bitches Peter won’t get rid of it because Tony said if he had to keep the hideous rock (’because it’s from me, babe!’) then Peter had to keep the hideous machine (’because it’s from me, babe.’)
But for real, they keep them because they love them (and each other.)