These flowers were so fast to make I forgot to take much in the way of photos. But the principle is the same as for my dahlia from an old shirt. These are easier though since there is no issue with fraying or general limpness.
Cut a strip of felt about two inches wide. For the dahlia, make tapered cuts. For the mum, make straight cuts. Roll the strip and glue as you go. Add a pin back to the back.
Two or three of these on a sweater or knit hat looks mighty cute if I do say so myself. Vintage insect pin optional.