1 Building large structures from cheap materials (bamboo, cardboard, plastic etc)
2 Arranging 100 or so small paintings in a grid pattern to take up a big wall
3 Presenting videos inside cheap structures like tents or cupboards
4 Installing large real world objects (the more unexpected the better) in front of paintings or videos. Start with a rowboat or a car and you'll probably get to a homemade working helicopter
5 Leaning large objects (the floor from a school room, for instance) against walls
6 Locating multiple screens in a long line (and they can be showing the same image, see repetition below) or as large scale panoramic projections
7 Isolating and spotlighting furniture (desks, tables, benches) to facilitate a visitor survey or some other bureaucratic task
8 Piling things or stacking things
9 Going for repetition. One plaster cat is dull, 1,000 not so much
Images: top to bottom, left to right. large structure - cheap material, piles, large real-world object, tv in a tent, survey and lots-a-paintings