Yep. This thread is totally on topic.
Thanks for all the different suggestions. I'm planning on trying small samples of each to see which is best. My stage manager suggested paper mache, so I'll give that a go too.
I need to make a French dessert called a croquembouche for a buffet scene in a play. It's a pyramid of creme-filled pastry puffs covered with caramel. It doesn't need to be practical, all it does is sit there and look nice, but it is the centerpiece of the buffet.
I have a design for it but...