All are 8"x10", and all include the required colour, can't remember which of the three it is for this batch. All colours are in all batches, and that solves that.
Sometimes the colours are laid behind a cut-out window - reverse applique? - and sometimes they're on top.
All are made on paper - found or recycled paper - stitched to a cloth backing. Sometimes the stitches are the conventional quilting stitch (running stitch) and sometimes it gets more interesting -