A basic concrete slab can be used for a patio, entryway or a surface for an HVAC unit to sit upon.
DIY Concrete Pavers are budget friendly, can be built to fit your space and look fantastic. Click through for a step-by-step tutorial to build your own bad-ass walkway. (Patio Step To Yard)
(CJ: Not comfortable seating tho.) Here's a video tutorial that shows you how to make your own inexpensive DIY outdoor bench using a few concrete blocks and some wood beams.