I have made hundreds of felted balls and used most for felt ball Acorns; just hot glue the balls to the acorn lids. I use these little gems on gifts and for decorations year round in different colors. I get the Acorn tops from my daughter’s house and I don’t even have to pick them off the ground.  I wanted to make up a mix of black and white and neither had the time or materials, so I looked on ETSY for felted balls for a good price and found “CraftyWoolFelt” at an affordable price and they are lovely, so compact and uniform.  If you are looking for felt balls for a good price and great quality check out “CraftyWoolFelt”!