You couldn't get too much more utilitarian than a pallet. This is an object of practicality so simple and understated it's almost invisible; not quite rubbish yet somehow unworthy of acknowledgment. From time to time one of these unremarkable articles crosses my path as the vessel for pavers or bagged builders' mix, and sometimes I find a use for them.
For example pallets make the perfect compost bin, one meter by one meter square and it's an easy job to nail three together to form the bin. The pallet compost bin also has another great advantage because the gaps in the timbers provide perfect aeration. I've had great results using these for compost bins.
A wholly more ambitious use for pallets is house-building. I recently read about a couple building sleep-outs using pallets with added wall cladding. The pallets were joined together using a sheet of ply on the outside, the cavity was packed with recycled polystyrene or rammed earth and the inside lined with either ply or plaster board. The design featured a simple pitched roof line over a loft and small living or office space, all in a footprint of around 10m square. At that size, in most council jurisdictions, it wouldn't even need a building consent as long as it followed a few boundary guidelines, and the building code of course.
In more modest projects, I've used pallets as a bed as a poor student and found the experience to be wholly satisfying once I had learned, painfully, that you do want pallets that are the same dimensions and that they do need to be bolted together as they can move around a bit - if you catch my drift. A mate of mine actually bolted his pallets together and raised the whole structure on casters: a coat of black paint and he had a pretty reasonable-looking set up. Well for a student at least.