I had also purchased 4 Styrofoam balls for 25 cents. I wanted something for my vintage painted White Clad side table that I posted. I created this button ball and put it in a tea cup.
It is easy to create and fun. I ended up adding in some other colors, but it would be nice in all white too.
You will need the following materials:
Styrofoam ball (mine were 3 inches)
Pins (I used ones with a large white head)
These white pins were great for adding more depth to the buttons and held them in place.
You want to use white Styrofoam balls. That way if you don't fill it in completely, all you will see is the white of the ball.
It is a nice addition to my side table.