I had these 2 very large tubs lying around. (They were those body building milkshake powdered drinks - not mine!!). Anyway, I thought they would make quite good musical shakers so my daughter and I painted them using black paint with some craft glue added to it.
I filled one with some kidney beans and the resulting noise was extremely loud so to try and have a contrast, we filled the other one with pistachio nut shells which both sounds and feels lighter! I need to get the glue out and fix down the lids, although I'm in 2 minds about that as I could potentially change the sounds if I left them accessible. This is not the sort of thing I would let the boys play with unsupervised anyway!