2 could make both sides of a purse. All 4 could make a nice table runner, or 4 separate placemats. Another of the many possibilities is to use wide sashings setting blocks and borders to make yourself or a friend a nice lap quilt. You could put half plates above and below the blocks, perhaps 1/4 plates as border corner stones.
I am very fond of Dresden Plates and have used them in many ways.