A large fistful of hornwort that I have free floating in a small tank. As hornwort has a habit of doing, it is taking over the tank and I need to get rid of some of it. 

Hornwort is great to have on hand if you need some "instant cover" in another tank, for uses like breaking up territories of aggressive fish or providing shelter for fresh fry. It is very versatile and grows rapidly in medium to high light. It can be planted like any other stem plant, but I've honestly always had better luck just letting float free.