A recent problem that waited a good long time for a solution was my bicycle-littered porch. My wife and I agreed that we needed a rack to organize a family stable of bikes that numbers between 4 and 7, depending on what's being built at the time (I regularly build or fix bikes for friends and local folks-in-need). For my rack, I imagined all sorts of constructions, but didn't really have the energy to cut and assemble. Like I said: I'm a lazy maker.
The solution I finally hit on was so simple as to be ridiculous: two wooden pallets leaned against each other. It's so simple that it's hardly worth saying a word about it; the picture ought to be enough. But following are a few thoughts ...
Step 1: Simple Pallet Bike Rack
Step 2: Simple Pallet Bike Rack
Step 3: Simple Pallet Bike Rack
Step 4: Simple Pallet Bike Rack
Long-term, the rack needs a bit of adjustment every month or so, but it is remarkably stable for a solution that involves no screws, glue, or even duct-tape.
*Note that this rack idea of mine first appeared on Flickr (http://www.flickr.com/photos/lowtechatmo/5845643031/), where it was spotted by Make Magazine's bloggers (http://blog.makezine.com/2012/03/31/wood-pallet-bike-rack/) and Treehugger.com (http://www.treehugger.com/sustainable-product-design/simplest-diy-ever-build-bike-rack-pallets.html), among many others.