Some of the items I have made from pallets.........
A rabbit hutch
A tool box for my Scammell lorry
Sheep hurdles
Flooring to keep bales of hay off the damp floor in the shed
Bird boxes
Large gate for my yard - about 12foot across (very heavy, but it did the job, now replaced by a galvanised gate, and now in the field separating the two halves)
Small gates (2) - still in use
Flower boxes
Temporary fencing
Numerous other uses, but can't think of them right now - I still have a collection of pallets for future use - think this qualifies as 're-using' for the 'green brigade'! Does this give you a few ideas?