Vako Design, Iowa, designed a series of concrete and wooden planters with an interior space in mind. Named Concrescence, the planters are designed so that they can be arranged in a variety of ways. Three sizes – wide and and tall.
I did this with red and white candles. It turned out super cute for the first stretch of the candles being lit, but once they started melting down and getting shorter, it wasn't as cute and now I just have a little metal bucket full of wax.