I have a love of free materials for many reasons, not least of which is that I feel fine having dozens of non-working prototypes when I’m building with garbage. It doesn’t get much “freer” than wooden pallets. Here are a few pallet projects I’ve found:

• Mikey and Wendy’s pallet chair, made in an afternoon and looking ready for an art studio:

• Pallets on instructables, including a pallet workbench and pallet planter.
• Plans for a pallet stool (pdf) (via Greenupgrader).
• Pallet art: high-end furniture from pallets (via Viridian Design)
• Pallet coffee table, notable for using mortar to fill out the table surface instead of breaking the pallet apart.
  
• At the extreme, a house made of pallets:

And, a few descriptions of pallet recycling:

• Description of how Safe Solutions reclaims wood for furniture from pallets
  
• Woodworkers discuss building with pallets
  
• Even Norm from the New Yankee Workshop gets in on pallet building!
  

Please comment below and let me know what other uses for old pallets I’m missing!