The roll label
Everyone thinks about starting their own business at some point in their lives, but finances usually stop this from happening. But what if you could find out how popular your business would be before hand. Here is an idea, get some roll labels, which you have have custom printed. Get them clear so you can stick them on the back of minivans.
Put your new company name - something catchy - and see if notice a buzz about it in your local area. If so, get started, if not the worst case is you spent a few buck some labels. Of course this idea is just for fun, but someone might do it. Anything is possible with cheap labels.