Very nice cards! A few that jump out at me:
The lovers-in-a-light bulb reminds me of the German fellow who recently tried selling the now-banned 100-watt light bulbs as Heat Bulbs, claiming that, as they emit more heat than light, they are legitimately home heating devices. I could see mounting that card alongside news items, or even snips of the relevant regs etc.
The lover-on-a-scaffold is a watercolor design. Gosh, I love watercolor postcards, as well as their near cousins, Tuck's "Oilette" series.
The two lovers-on-a-beach drawings remind me of my love of all Line Art on postcards:http://goscf.com/t/38451
The Grus Aus ("Greetings from Nebraska City" and "Greetings from Friendsville Illinois") cards date from the time before Curt Teich dominated the Grus Aus market in the USA with their definitive Big Letter linen designs. I set all of these aside for an 'eventual' Grandfathers of Grus Aus binder showing the evolution of the form.
Q/ How does a place the size of Friendsville get it own Grus Aus postcard? No wonder they called it The Golden Age.