These are bottle charms that I made with Shrinky Dink that turned out about 3/4". . .
Bottle Charms by stamp1 at Splitcoaststampers
I used Marvey giga punches (the pic is with the scallop punch, but I also made some with giga square and circle punches) and a 1/8" punch for the jump ring hole. I stamped with Palette Noir ink for the outline stamps and colored with Sharpies. I also stamped some solid images with SU classic inks, Adirondak and chalk inks. When you shrink the plastic, the inks are melted into it so you don't need to worry about smearing (although it is easy to smear them before if they aren't dry). I used my heat gun to shrink them, holding them down with a piercing tool or a sharp pencil thru the hole. I finished the charms off with 7mm jump rings and ponytail bands. The charms in the picture have 2 bands on them, but I made 100 more with only 1 band and they work great.