Start with two Modern Cross quilt blocks.
Proceed with making many more blocks. Don't stop until Susan Beal says it's ok.
Then, most important, don't stash the pile of blocks away in a tidy pile somewhere. Don't washi tape them to the wall, either, 'cause their wall+cute factor might just weaken your resolve to square the blocks, sew them into strips, decide on batting (then haul your ass out to buy it); cut and assemble the quilt sandwich, then make the binding after puzzling over approximately 14 tutorials on how to do same.