Just a few days ago I pointed out the Vello LCD Sunshade for articulating LCDs. A few comments pointed out that they were looking for a simple hood that attaches to a Zacuto frame. I'm guessing because they don't have a swing out LCD that the Vello can attach to. Today I run into this other simple LCD hood / shade on eBay that can attach to both 3" swing out LCDs or to standard rear LCD monitors.
As simple as these things are, if you've even had to cover your LCD with your hand, you'll know how helpful it can be to help set color and exposure in the bright sun. It attaches over the DSLR body through bungee straps which doesn't look overly complicated for you to DIY. Some firm cardboard, a bit of cloth (heck even duct tape), and a stretchy garter should be enough to make your own version for any size LCD. You can see more images of how they have it put together at the product page (Click here).
3" DSLR Video Camera LCD Video Sunshade Hood