Try this: Use the pencil tool (it's with the brush tool in the toolbox menu). Use a small hard nib. Left click to put a dot on the paper, hold down the shift key and then left click again - ps will draw a stright line between the two points. In this way you can build up rectangles of any orientation quite quickly. Because you will be drawing them by eye, the angles might be a bit wonky but with a little practice you can quickly get them so they're good enough - and a little variation in the angles looks better than every angle being exactly 90 degrees.