it has to include 2 or more (inclined plane, pulley, wedge, wheel and axle, lever, and screw
Like you listed, there are 6 simple machines and a compound machine combines two or more of them. The goal is to perform a task. This link on Ehow shows how to make a compound machine using a soda can and some yarn.
The trick is to connect them with something to form a chain reaction. For example: you could have a wheel and axle roll down a ramp, and at the bottom of the ramp it hits a lever, which pushes something else up. I recommend looking around your house for old toys and items that you can use to build it, then playing with them to see what you can do. You can also use trash/recyclable items such as the lid of a container for a wheel or pulley. Just experiment and see what you find!
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