No one mentioned the most important...A Walking Foot for your sewing machine...Best investment you'll ever make.
Love my Rotating cutting mat, 12x12..no having to lift your ruler and place down again just turn your mat
My new favorite is Curved Safety pins...can't have enough of those
Pin cushions filled with pins in every spot you sew...I never seem to have enough
Back cushion for you chair
Non slip mat for your foot petal
Love my Fons and Porter Design Bd bought at Joann's with 50 off coupon
As many rulers as you can find...I have them in all sizes and shapes...