I did this a few months ago, but I forgot to tell you all about it. I grew a bunch of Urea crystals in a cup. I actually tried to grow them on a piece of paper with a Christmas Tree on it to make them look like snowflakes, but they just grew like wildfire on the cup. Urea, if you don't know, is an ingredient of pee.
You might say EWWWWWWWWWWWW, but wait and consider. What makes pee gross? I would argue that it is the smell that makes pee gross. What is it in pee that makes it smell? It is the ammonia. Urea is just a salt. It doesn't smell. Therefore, urea itself is not yucky.
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