These hills were created using the oiltank primitive. I added a UV map modifier to make the material fit better
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The tubes were just that tube primitives with the top few poly extruded.
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The wall blocks were a simple box primitive with some of the edges extruded to created the blocks.
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The man eating plant was created from two half spheres and then two torus for the lips. The teeth are just vertex pulled out from the lips.
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The coins are simple cylinders with the edge polys extruded.
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Little mushrooms again not to difficult. The top is made from a half sphere, while the stalk is a cylinder. The top was pulled up slightly with an FFD modifier
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The finish flag consists of a cylinder with a taper modifier on it. A sphere at the top of the cylinder and a simple plane for the flag.
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The other green hills were created again using the oil tank primitive with lots of taper modifier on them.
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The lighting setup is a dome with a sky image. The whole image is lit by a single target direct to simulate the sun, and a simple omni to illuminate the BG image.