What a spectacular find and share! I just looked at the entire PrintablesByMartiJo Etsy site. They have many cool things. I will put the links for the great backgrounds later in this post.
There are a few other items that look worth sharing. I really do not know about sizing but I know that Donna sized her room boards at 20 x 30 inches and had them printed and mounted on foam core at Cosco.
I thought the Printable Vintage Luggage Labels would be fabulous for many of our dolls. But the site has various eras of luggage labels. Here is that page: https://www.etsy.com/listing/1050683278/printable-vintage-luggage-labels-super?ref=shop_home_active_557
And the Vintage Candy labels looks great. Do you think you could size down for various doll scales? https://www.etsy.com/listing/985876704/vintage-candy-labels-kit-1-29-printable?ref=shop_home_active_41&crt=1
These luggage labels look a bit more modern but may work for flapper era dolls. https://www.etsy.com/listing/944086104/printable-vintage-luggage-labels-kit-1?ref=shop_home_active_49&crt=1
Both of the following links are based on the 1950s.
Here is the 1950s lovely home printable: https://www.etsy.com/listing/972682784/vintage-paper-doll-house-scenes-2-15?ref=shop_home_recs_2&crt=1
Here is a commercial scene with so many possibilities for those of us who collect Gene Marshall or other dolls based in this era. https://www.etsy.com/listing/981315568/vintage-paper-doll-house-scenes-3-18?ref=shop_home_recs_3
The interior scene that Donna introduced to us is from the late 1880s, so absolutely perfect for dolls in this costume. Here is that link - https://www.etsy.com/listing/941999818/vintage-paper-doll-house-scenes-1-15?ref=shop_home_active_558&crt=1
I assume you just take your memory stick to the print shop. Wow, instant and GoRgeOus!
Trish El Paso