This is a really great way to use up odds and ends of yarn, and there is no limit to what yarn you can use (I have experimented with lace weight silk, Rowan Kidsilk Haze, baby bamboo, Debbie Bliss chunky cashmerino and various weights of mohair and tweed).
Once you have your flowers, you can sew brooch pins onto the back or attach them to garments or hair clips.
Most of the corsages pictured here are the results of freeform knitting experiments, with an occasional use of crochet around the edges. Some are straightforward rosettes, achieved by steadily increasing on every row. On others I played around with methods to achieve different flower shapes with petals. The centres have mainly been adorned with vintage beads from my collection.