A general overview
First of all, you have all kinds of interesting containers, from classic to just plain wild. Don't limit yourself to only commercial pots. As long as you can provide adequate drainage, many flea market or garage sale items can make perfect container gardens. (Tea kettles, wash basins and wheelbarrows are just a few examples.)
You have all kinds of great places to put a container garden - from a tiny balcony to a bare spot in a huge garden - or even indoors. You can hang them from poles or on walls, or set them on rolling carts - or even - (dastardly thought) just put them on the ground!
Finally, almost anything that can be grown in the ground can be grown in a pot - and a few things actually prefer being containerized. (Is that a word?) You can change your floral display seasonally, hide the plants that are getting tattered around the edges, and generally, with a little slight of hand and a wee bit of planning, fool people into thinking you actually know what you're doing.