all kinds of things you add water or a liquid scent and they grow from about the size of a celery seed to the size of a small marble they can be used in center pieces or in a small bowl for the scent in aquariums or terrariums in cut flowers or to grow seeds I use them to grow the wheat grass I also have for auction you can see it sprout in about 2 to 3 days a lot of people use them just for looks they sparkle in clear vases or you could put led lights or tea candles in them to give them an extra glow everyone that has seen them wants a pack they do pretty well on here and i have hundreds of packs