Anyway, I prettified both tape dispensers that wandered into my path while I was on a craft mini-rampage Monday evening, and it was so easy that I feel kind of like a doofus that I didn't start doing this years ago.
Aren't they cool? I even wonked up the cutting a little and it totally doesn't matter at all. (See, look closely at the center of the one with the swirly paper. There's a bit of a jagged edge around the hole, but it's pretty non-offensive, IMO. I'm sure it would give some people the twitches, but I still think it's way better than the plain version of the dispenser, so I'll ignore it. ;))
To make your own, just pop the tape roll out of the dispenser, take out the piece of paper that's already in there, and trace around it onto a nice-looking piece of paper of your choice. (You could even use fabric. I considered it for about two seconds before I decided I'd mind less if I messed up a pretty piece of paper. Which is a silly thing to worry about, since it's pretty hard to mess up this mini-project so badly that it doesn't instantly make your tape dispenser(s) look better.) Cut inside the tracing lines (if you cut outside them, your custom insert will probably be a wee bit too big) and pop your pretty paper back into the dispenser, then put the roll of tape back in. DONE! Seriously. Easy.
Credit where credit's due: I got this from Helena at Craft and Creativity, but she in turn got it from someone else. Maybe we can turn custom tape dispensers into a crafty meme. Go ahead, pass the idea on to all your craft friends. ;)