The cold month of February is the time to start seeds, and to start preparing planters for your container plants. Building cute and functional planters is a way to make the best of chilly days spent indoors. Whether you are planting annuals in a window box, or vegetables in a vertical garden, there are so many awesome ways to make cheap, environmentally friendly planters that don't require you to be a professional carpenter in order to make them.
For totally low budget planters, think old two liter soda bottles or plastic milk jugs. Large plastic bottles or jugs can simply be washed thoroughly and cut in half. Drill holes in the bottom for drainage, and fill with potting soil. This is a super cheap DIY planter solution, although it is not perhaps the most aesthetically pleasing. An advantage to it is that it's easy to hang upcycled plastic bottle or jug planters from railings. Urban gardeners, who only have access to a fire escape, can utilize the outer and inner sides of their fire escape raiings by affixing these planters at alternating heights, to essentially make a vertical garden.
Pickle buckets are awesome as DIY planters. Grocery stores and restaurants receive bulk pickles in four or five gallon buckets. Sometimes they return them to the distributor, but sometimes they throw the pickle buckets out. When in doubt as to whether a stack of pickle buckets behind a store or cafe is waiting to be picked up by the garbage collector or the distributor, do the right thing and ask the store's manager. When you are sure that the pickle buckets are destined for the dump or the recycling facility, then grab a few and use them as planters. You can make self-watering planters from pickle buckets, or you can drill drainage holes into the bottoms. You can grow quite a lot of food in a pickle bucket.