Other sections of this website teach how to make strips that you can use to interlock into party chains. They can be attached together with tape or by joining strips with staples.
Naturally, you'd alternate between strips and loops. You can make complete unbroken loops simply by using the remove the top technique on an open-topped can.
You'd make the signs by removing the top and removing the bottom of the can to make a cylinder and then scissoring-open the side.