If you are considering landscape paving, this excellent Houzz.com post by landscape architect Falon Mihalic includes guides to 10 of the most popular materials.  Focused on cost, climate, maintenance and functional application, the guides explain the pros and cons of cast-in-place concrete, the cheapest option, pre-cast concrete, gravel, limestone, brick, slate, tile, bluestone, granite, and travertine.  Mihalic also notes that many of the materials can be reused and suggests where the cost and/or environmentally conscious consumer can find them.  To read more click here.