Passenger car interiors - window finishes

I am working my way through building a reasonable replica of one of the D & H’s business cars in HO scale. I need a source for downloadable, printable flooring and window treatments: drapes, blinds, etc. I’d appreciate any leads.

I use off white (ivory) ribbon from a fabric store cut to different lengths to simulate blinds in windows for both buildings and passenger cars. I get the kind that has slight ribbing. Covers vacant interiors quite well. Can be split longways and ‘fringed’ at the bottom to simulate curtains. One $2.00 roll will do a bijillion windows.