Saw the idea on Pinterest. Went down to the thrift store, picked up some old records. Put them in the oven at 350 for 15 minutes. For the bowl, I used a stainless steel mixing bowl and let it melt down over the curve. For the lipped trays I used the same stainless steel bowl and let the record melt over the opposite side of the bowl so that only a small amount of the record melted. This was SO FUN and easy that I can see myself doing a lot of fun things with these.