I’m working on storyboards for Tar of Zandoria, and by serendipity discovered that the business card that I was using as a template to draw rectangles in my sketchbook is the correct aspect ratio for 16:9!
I just grabbed it because it was handy, and a good size for me. But it seems so obvious and simple–and readily available–you can draw storyboards anywhere! I don’t recall anyone ever sharing this as a tip before–so here it is 
