It was TheMagpiesEyeCo on Etsy. They only sell epoxy buttons, but they have a bunch of different kinds.
You think it's big now, just wait until July. Reddit's api changes are going to force people off of the site in droves. Right now it's a lot of noise and some movement, but a lot of the regular user base hasn't actually felt any effects yet. Once the changes make the site unusable for a lot of people there will be a lot more.
Rainbow Rave Drawstring Backpack
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I figured this community could use a little content! I freehand crocheted this bag last August using the magic circle to start the bottom, mosaic crochet for the body, double crochet for the flap, and spiral rope crochet for the straps. The button was purchased from a vendor on Etsy.