I promised more flap ideas and this one is super easy and was actually done by one of my students during a class I taught.
She has sewn Rick Rack diagonally across the front of a flap and then interspersed a few buttons in- between. This could be done on a Decor Bond base or a batting base. Put a large scale print or holiday print on the other side of the flap and it will be reversible.
This is so quick and easy that you could make it today and use it tonight for your guild meeting.