I started converting some of the maps I have drawn into G+ Event Banners for my own games. I think they came out looking pretty good and more banners for use in scheduling your RPG related events is always a good thing!
To use these banners for your own events right click and save the image to your own computer. When creating your G+ Event you can choose Change Theme and select the Upload option. Drag the uploaded image to the box or browse to the location you downloaded the map banners to.