I made those with the foam ball, I used a paring knife to push the fabric into the ball untill it was all covered, did it with egg shapes too. I think you would have to draw your pattern on the foam board and score it lightly with an exacto knofe then just cut pieces and push into the score marks sounds like a fun project!' Here is a picture of one that just happeded to be laying here on the bookcase not a very good pic tho.