Portable recycling/trash Bag Holder : perfect for BBQ's, camping, parties, etc. and for recycling too! I would probably keep it away from the food table though, but I like how it doesn't take up much space for packing on a trip!
Minivan with DIY sleeping platform and drawer system. My weekend of event with rain has just got better! Would have the drawers removable to put strollers under platform and still be able to get out after loading the back from your walmart run.