I have been doing them for quite awhile. We just used a dozen blue and silver ones for centerpieces at a temple event and then gave them away as door prizes. I found that if I donate some to an event with the request that I can insert a business card and flyer, this generates a bunch of orders. And it lets the event use something different than the standard centerpiece and have a free giveaway. Often times they will mark something at the table (under a plate or cup) with a number and whomever has that number gets the centerpiece. A win for everyone!