Here is a web site I found where this woman takes vases, candle holders, and plates to make cake stands...

dont know how sturdy they would be, but here it is...
http://www.designspongeonline.com/2008/05/diy-project-kates-recycled-cakestands.html

Im always looking for that different kind of stand....

As a few mentioned they would not safely hold more than a 6" round
I have used glass vases and jars a few times.