I like to use smaller blocks in small quilts. Bigger blocks in big quilts. For example I have been working on a quilt for my husband that is 98x112, the blocks are 14 inches each. They look fine. Where as I would NEVER make a twin quilt with this size block.
I made a lap quilt using 12 inch blocks once. I hate it. The size of the block looks disproportionate to me.
I'm not fond of square quilts either. They gotta be oblong.