Acid-stained Concrete Patio -- Looks like copper! Click the pic for a brief how-to video on doing this technique. I'd love to do this, although I wonder if the acid stain is bad for those plants around the patio.
DIY: Garage Door Makeover With Gel Stain - this is a quick and inexpensive way to add curb appeal to your home. I could practice with my garage door MR ran into with dirtbike. Use ebony or dark gray stain.
Fountain: How to Build a Concrete Fountain, Create a stone-lined garden pond, then carve a waterfall out of a block of stone using basic power and hand tools. The technique is simple, even for beginners.