I have been having a lot of fun making cardboard Christmas ornaments. I load reference photos on my phone or device, sit in my well-lighted chair and sketch out little houses on cardboard. After I get the design figured out, I use a water based white permanent marker in extra fine tip to finish. I like pizza boxes as the right weight for this. They cut easily with a scissor.
I went through different stages and ideas.
At one point I got into Hobbit houses.
There were a few gingerbread houses.
And some barns. Lots of fun.
A little Dr. Seuss.
My first efforts were a little clunky. They improved after I got an extra fine tipped pen.