These are a great idea if you are good at craft or want to make something very unique for your event. Don't under estimate the amount of time it will take to complete though. Get your family, friends & work colleagues to start collecting jars & bottles as soon as you can and aim to complete a few each weekend, storing them carefully. Any you don't need can easily be recycled.
Put rubber bands around a vase, spray paint with metallic paint by rust oleum found at home depot. Possibly aluminum colored paint or stainless steel colored paint. Let dry, then take off rubber bands. Must try.