I can't find a pic now, but I remember back in the Color Classic forum on applefritter's hey day, there was some dude on eBay who'd put a Zip drive into a CC by cutting out a nice .75"x4" hole where the floppy slot used to be and flush mounting a regular internal Zip there. It made those poor CCs even hideous-er. Seems like he was selling them for a couple hundred even back then. Don't know if anybody ever bought one.
Of course this was back when a Zip drive was a legit upgrade to a still useful machine. I recall buying a 128MB USB thumb drive around then for $130 and thinking it was a steal to get close to the 1M for $1 range.