This free scroll saw pattern has three plates. 8", 6" and 4" patterns are included. The 4" pattern is great for coasters.You want to cut carefully on the small plate. You don't have much glue surface so don't cut it away. You might also consider using super glue if you have trouble with regular wood glue.
I know this is a very simple pattern but it has so many uses I thought I would post it.