Cheap Bike Lock

As I've always said, locks are for honest people. This is a simple lock to thwart the common bike snatching. I also tend to ride old bikes worth less than a Kriptonite so, this works for me.
Chain & S-link

I had an old chain with this "S-link" on it. I attached the link to the break cable stay that is no longer used.
Lock It Up

This is just on my bike stand. I usually lock to a shopping cart, BBQ, garden tractor, or what ever my be by the exit in plain sight.
Lock Up Your Friends

If I stack them I can comfortably lock up to 4 bikes. Picture me rolling :)
Sleeve It With a Bike Tube

I get a tube in proportion to my link size. I use a string and soap to pull it all together.