While browsing another of my favorite blogs, Calgary Garden Coach (which is fantastic considering I live in Calgary!), I found a great, simple, and FREE idea to make fake wasp nests. Basically you make a nest and hang it in potential nest spots to deter the real wasps from nesting there. So simple, yet I see the fake nests on 'sale' for around 2/$5 or more. However, this is a project that requires zero crafty skill, I'm betting you already have the supplies on hand, and takes literally two minutes.
Take some old newspaper and crumple in balls. Stuff into plastic shopping bag and tie closed. Stuff this into a paper lunch bag. Hang up in the corners and other places wasps may like to nest in your yard. Done! Even with my 'helper', this took literally minutes to do. I really hope it works!