My latest project: kimono silk button brooches using a kit from kimoYES. The kit comes with 10 x 4.5 cm diameter button fronts and backs, brooch clasps and glue (for attaching the clasps). The fabric choice is up to you. I have slowly been accumulating a small stash of vintage kimono silks without any specific purpose in mind. And at last I have found a purpose!
Really, any lightweight fabric would be suitable for making these brooches. And it's a great way to use up those precious scraps of fabric that you just can't throw out.