Generally I make the compact accordion (which is almost identical but smaller) as that is my preferred size. Variations I have made include:
- different fastenings (turn locks, purse edges etc)
- piecing the main fabric in different ways. You can piece it however you like as long as the finished piece is the same size as pattern piece
- different materials (cotton, PU, tweed)
- change the flap shape so it is curved instead of straight
- adding a wrist strap
All look good in different ways! My personal favourite is a curved flap in tweed with a bold lining fabric.