How about something like this? I send these to swap partners as part of their gift. I used them when I made a Labyrinth quilt - much better than labels which always disappear and pins that stab you, lol!
I buy the beads on eBay in alphabet sets. You could get number ones instead. You could use curved safety pins instead. Also, you could make a little pouch to keep them in or pin them to a pretty quilted mat.
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Put a note in, advising that they use them in seams. I read somewhere that pins left in a quilt for a long time actually rusted!
