All you have to do is change the base, and it becomes an elegant test tube rack. The tutorial is here, and it's so easy to accomplish by yourself or with a buddy. If elegance is not your thing, you could easily change the base and flowers to suit your style. The other great thing is that you don't need that many flowers to fill a test tube and get a full, lush look. It would be equally striking as a more minimalist, modern centerpiece with a single flower in each tube. I'm thinking a metal rack, or a couple of those single test tube holders crowded together.
Oh Design*Sponge, how I love thee. But first, some background. Andrew is a science guy, and I am a literature girl. For a while now I've been thinking about different ways to incorporate Andrew's love of science into our wedding. One of the first presents he ever gave me was a necklace inside of a test tube he made himself. How cute is that?! I still cherish that test tube. Based on that memory I half-jokingly threw out the idea of test tube rack centerpieces that would act as bud vases...and he loved it! Score 1 for team science, but in my head it looked kind of kitschy (remember the wooden racks from high school chemistry?). Enter Design*Sponge stage right with a beautiful take on this idea: