I started building larger ones and found a "Green Library" in the neighbourhood
There, I would leave and donate seedlings from my little garden.
The peppers, mint and tomatoes mostly.
The basic idea of the green library is to donate and adopt seedlings, pots or tools.
You leave a handfull of small plastic pots and take a handfull of seeds in return for example.
I would take a few small pots to plant things seperately and returned them a month or so later when I was done with them.
Sometimes people would leave random seeds and I would try to see what I would get.
Although, I ended up buying small packets of seeds myself. So far I've only taken some pumpkin & Strawberry seeds from the Library.
Now, I have a small garden with a quaint selection.
Tomatoes, Pumpkin, String Beans, Strawberries, Bell peppers, Hot peppers, Broccoli, Leeks, Onions, Carrots and Potatoes
I also started some herbs and such.
Mint, Celery, Garden cress, Lavas and Cat mint