I grew some epsom salt crystals in a jar. I saturated hot water with the crystals, poured some in a jar, and set the jar on a shelf for about a week. After about half the water evaporated, a thin layer of crystal on top of the water was slowing down further evaporation, so I just dumped out the remaining water and and let it dry for another night. I placed a small piece of purple sponge in the jar, which made the photos a little more interesting. Here is a photo of the jar:
Here are 8x photos of the crystals, just using my wife's cell phone camera:
