Recently, urbanite, or broken concrete, has become a popular paving material. It is often irregularly shaped and is dry laid, giving it a very similar look to flagstone paving. Furthermore, concrete, even the old discarded type, can be stained a variety of colors to create a unique patio or path. Urbanite can be acquired, often for free, from demolition sites in your local area.
10 Things You Must Know about Paver Patios: Your options for an outside area are vast, but if you want the best value with the lowest maintenance, a paver patio is the way to go. While it may cost more up front, the savings over having to stain and seal it year after year will pay for itself in the long run. From DIYnetwork.com