I don't have a fence, but like this idea. Find old windows, replace the glass with mirrors and put these on your fence (if you can). The mirrored image of your garden on the fence will make your yard look bigger. It's an easy trick!
Pine Cone Mulch - an attractive border and maybe a practical way to keep dogs and cats out of your garden beds. As they breakdown, they will add nutrients to your garden too. Pine cones also look great as a decorative mulch for container gardens.