If you can peal off the labels do so. Some of the jars are so pretty, but the labels don't come off with out scratching the jars itself. Those I paint, then make my own labels. You can buy labels at an office supply store, or make your own and mod podge on. They are great for holding bathroom things or jewelry or any odds and ends. A friend of mine downloaded creepy labels for Halloween and made apothecary jars.
I usually glue a knob or gempiece to the lid and use them to store cotton balls, Qtips, hair ties.
clean the jar well, refill with a make your own bath salts, or set a tea light in the bottom.