They're little flowers/leaves from a stock of origami paper by ~Geek-Stock
Included in the .zip are:
3 GIMP animated brushes (.gih) of maple leaves, chrysanthemum, round flowers
22 individual, regular brushes (.gbr) of each leaf/flower in the animated brushes
22 .png versions of those
Sizes range from about 170px to 270px in width, most are slightly rectangular.
I'm fine with them being used similar to the original stock's rules: [link]