Fortunately for me, some plants reliably come back every year.
Vinca minor groundcover.
Some type of tazetta daffodils (several blossoms per stem).
I hope we'll get a few peaches this year.
I haven't found any volunteer tomatoes but I have volunteer something growing in this little pot.
Homer's dandelion has reached proportions almost as vast as Homer himself, growing as it does next to his outdoor lavatory. (Homer uses the area to the right of the tiny fence.)