Apparently 40 years ago or so... manufacturers used to include a Mason jar in the box with the blender. Mom recalls even a booklet that listed the many things one could make with the Mason jar blender, including ground spices, whipped cream, and peanut butter. We use this trick most often to make whipped cream. The blender whips it right in the jar, so if we have extra, it's already in a jar for storage. And it is easier when it comes to making small quantities.
Not only is this little set-up great for smoothies that you can take on the go, but it works great for grinding coffee beans, spices, and as a makeshift food processor.
via Workshop SF