This technique is very easy! Just wrap the wool around the styrofoam egg and stab it repeatedly with the felting needle until desired degree of felting is reached (mine are quite firm). Just watch - your - fingers!! Trust me, that needle is wicked sharp. Ask me how I know. ;)

It's a quick project too - after a little while I only needed about 10 minutes to complete each egg. (They are quite small, about 1,5 cm in height.) I keep mine in a bowl, but they could just as well be hanging from something. My mom will get some for christmas I think!