It all depends on how many HSTs or QSTs I want. For just to collect I save like sized squared together. For a project that only needs a few then I make them as I go. For a whole lot I use something like Thangles.
I dislike cutting scraps into triangles. I know I won't be taking care of them correctly. I don't want anything starched just waiting to be used. I used to live in climates where bugs were attracted to such things.