Decorated hatpin flowers are a currently popular trend in altered art and in other types of mixed media art. Hatpins are hard to come by, these days, however, so many of us use corsage pins instead.
The hatpins in the photo above are decorated with flowers made from shrink plastic (or Shrinky Dink).
These flowers were made for a decorated hatpin swap in a mixed media group.
Want to see the process? You will find a video demonstration at this link: Decorated Hatpins with Shrinky Dink Flowers.