Great things can be made with recycled pallets, as seen above.
When choosing your second hand pallet take care not to get one treated with Methyl Bromide (MB), the pallets are labelled with the following codes, Heat Treated (HT) would be a safer choice.
ISPM 15 mark
•YY: is the treatment abbreviation where:
• HT: is the code for heat treatment to a minimum of 56º C for a minimum of 30 minutes
• MB: is the code for methyl bromide fumigation.
More information about the labelling for pallets here http://www.daff.gov.au/aqis/export/wood-packaging/faq-ispm15
More information than you ever wanted to know about pallets http://en.wikipedia.org/wiki/Pallet
Free pallets are sometimes advertised on Gumtree