My design sense seems to be roughly queen sized, say something around 80x90 inches. A little wider, a little longer, all is good. I do try to stay under 100" in length but not always...
But try to get me to something smaller and I have troubles with design. I can follow directions or patterns but do not myself think smaller than about 48x60".
I joke about it with my husband -- that I am just glad my art is quilting, it would suck to have the desire to work in metal like Calder mobiles or stadium sized pieces.