A customer in Montana sent photos of cabinets we built for him to use with the Rakks system. This company is one of many that supplies wall brackets or free standing brackets that can accept cabinet boxes or shelves. There are a wide range of prices between the companies and many reviews comparing them online. They are especially a good option for piecing together a whole wall of book storage/media storage/desk space or whatever your needs may be.
This is a link to one of my favorite companies doing this, they are one of the more expensive options. I really like that they use cold rolled steel instead of aluminum, mainly for appearance reasons.
Yet another product out there to get your living spaces more efficient.
Have a great week!