Yeah.... 1x1s that I'm comfortable with have hardly any structure beyond time period and characters. "Clearing Skies, Rising Sun", my 1x1 with sledge, has become so intricate, and its totally free form. We didnt plan it besides "hey want a 1x1?" "Sure, lets use so and so with so and so." "Sure, fine." I feel that a lack of rigid structure is what makes a 1x1 so informal and comfortable.