I pallets! Just a couple of examples of many many uses for them. Pallet planter and kitchen herb garden in my back garden. Pallets are such a versatile material to work with, although can be a bit tricky to take apart if you don't know how! With so many of them often left lying around just asking to be upcycled, they are very easy to get your hands on cheaply or usually for free (get yourself down to the fruit markets in town there's always loads going spare!)
With a little bit of love, even the most ordinary and boring can become fabulous!