Here's a couple:

1. Fill an empty plastic milk container or coke bottle with some dry rice or pasta and superglue the lid on. Very ordinary looking toy, but they love the noise!

2. Recycle milo tins or formula tins by decorating them with pretty pictures, numbers, letters etc and put dry rice or pasta in them and superglue the lids on. The tins will roll along the floor as baby pushes it and also make a nice noise!