For many years, I've been extremely interested in traffic lights and railroad grade crossings. I've also been very interested in traffic & road signs and in the ways that they've changed over the years. For example, I remember when triangular Yield Signs in Michigan used to be a deep yellow with navy blue lettering. Now they are red & white... and I still miss the old ones!
Take a look at the Header and the Avatar to this group, and you'll have a pretty good idea of what kind of wallpapers to put here.
UPDATE: Since the Avatar & the Header/Cover Image Refused to load properly, I have made them into Wallpapers. If you click on the Journal Post Link in Group Details, you will see them. Also in this journal post are great examples of what I am looking for. You may discover that some of your own wallpapers have been used as examples! :D
Wallpaper submissions will be monitored... but don't worry, this group will be checked very frequently! I'm very excited about this group and am looking forward to seeing what is contributed. : )