Hide your air conditioner unit or even your garbage cans by building this lattice screen. Free instructions at the link.
Add a lattice screen to your deck for added privacy. Here is how you go about it.
Build this lattice privacy screen for your backyard with this great tutorial.
This is a link to a Google 3D SketchUp drawing for a simple lattice constructed from treated dimensional lumber. You will need the SketchUp software to download this drawing and its freely available online.