I like 9 patches, 2.5 " squares. I feel like 9 patch blocks have so much potential for variety in the layouts, or with the addition of some hst in strategic places of the 9 patch.
I also like using scraps in log cabins, and I use fairly thin logs, under 2" there. I've been known to piece my logs in a log cabin, making it even more scrappy.
Snow balls can use up some small scraps too. I just used the 2"off cuts from another project to snowball a bunch of 4 inch solid squares, and alternated them with traditional 9 patches, for a real scrap buster.