I use the colored paper clips mainly, but I do also use cut up mini blinds with holes punched in them. Here's a photo Fred took of his.
You write on them with pencil and if the cross didn't take or you want to reuse the next year you can just cross it out instead erasing it and write the next one. I used these if I had a pollen that I only used once or twice. If it was a pollen I was going to use quite a bit I gave it a colored paper clip
