Ask at your local library for 'A Source book of Shapes' by John Hunnex
Don't forget to include some idea of your location in your profile... it might bring more response if peeps know where you are :wink:
Afterthought... make a couple just for the fun of it and experiment with shapes of your own design... don't be surprised if the shape has already been made by someone else... original thought (and design) is a rare commodity :shock: