Two things I love: neon and succulents. So why not combine them together!
Supply not pictured: potting soil
Start with your empty jar, filling up the bottom most portion of it with either aquarium gravel or pebble gravel. This will serve as the drainage material for the succulent whenever you water it. (Also… I may have taken some gravel from my backyard and spray painted the pebbles because I wanted some gold!)
Next, place in at least 2 inches of potting soil into the jar so that the succulent has enough space for an needed roots. Then, place in the succulent and secure it in with additional soil.