If this has happened to you, and you don't know what to do with the bowls with the checked rims, you might try building a "mbira."
These African instruments are pretty easy to make. Flatten the rim of the bowl (which lets you carve out the cracked lip where the rings were tight). Plane a thin top (I used pine here, but I am told that the material used for the top of an instrument has a big impact on the sound quality. Koa? Spruce? Mahogany?) Glue a block of wood to the underside of the top and put t nuts into the block, into which you can anchor the screws that hold the aluminum rod above. Glue the top onto the bowl, trim to shape, and bore a sound hole. The silver bar is aluminum (easy to machine), smaller bar is brass (looks nice and matches the brass screws), and the tines are made from a sewer rod (a new one!) You tune the instrument by pushing the tines in and out to get the right tones. Lots of different tunings--I tuned mine to the C-scale, diatonic--good for jingle bells.