DIY + a trained electrician

I have only a rough idea of what we're going to do for our reception centerpieces, but this much is known: it will involve putting some untamed-looking floral arrangement into vintage blue mason jars. My mom and aunt have hunted down about 30 of these things, which leads me to wonder what I'm going to do with them afterward. Here's a really awesome idea via Design Sponge:

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This takes care of 4 out of 30...