For now, though, I ran across this fun way to dye them with Easter egg dye (I think I've also seen Rit dye versions.) After
I left them sit for a long time. I wasn't paying much attention, but probably a whole naptime-- 2 hours. Surprisingly, they turned out great. The colors are super vibrant, unlike the eggs that were dyed in that same dye. And now, I have a cupful of colorful clothes pins! I'm glad that I bought one extra box of egg dye just in case it worked out and I wanted to do more later.