From time to time I end up with those plastic containers that once housed strawberries or spinach. According to my curbside recycling guide they are not recyclable (differs by refuse company). So, I like to reuse them when I have them. Besides using them to organize my pantry or the kids markers, we make them into little seed starting greenhouses. You can buy a fancy seed starter system, but I find these work just as well and are easy to transplant.
Simply fill the bottom with soil and sprinkle in the seeds planting to required depth, water, close the lid and wait. I have successfully started onions, herbs, gourds, chard, and numerous other plants this way.
Once seedlings have reached a level of growth where they will tolerate transplant, usually when they have developed roots and true leaves, I use a chopstick or spoon to separate out these tiny plants which then go into either 4 inch pots, or in the case of onions and squashes right into the garden.
Plastic containers need to be thoroughly cleaned in between plantings to discourage disease.
What other uses have you come up with for plastic containers? Happy planting!