These are rainbow grapes. These grapes aren't a rare species, they are created during Véraison (when grapes turn from green to purple as they ripen). Photo by Olasupo/Laritech Garden Seeds Branch Company
Genius slipper design where you knit a short "scarf", fold and sew onto your bottom. Garter stitch extra chunky yarn about wide, and however many rows you need, then sew into the 2 layers of the felt bottom.
Flexible fabric glue is what makes the lace stick without making the shoe stiff and uncomfortable to wear. This is also a great hack for a pair of super comfy but stained shoes that you just can't bring yourself to throw away.