Heart Shaped Pins
We got these in especially for a specific customer and they've been popular! She uses them to hold her pieces of knitting together for sewing and you could use them for that or with crochet bits too (and medium weight fabric too!). You could also use them to mark the placement of features on a toy's face or buttonholes or even just to keep finished bits of knitting and crochet together in your project bag before it's time to sew them together.
The heads are heat resistant so you can iron over them! The large heads also mean you can see them and grab them really easily.
They're 0.55mm diameter and 50mm long, 20 pieces to a pack.