Thank you! That’s exactly what I’ve been doing! I’ve been building an asset library of objects to be able to pick and choose them for scenes. Here is a portion of the watercolor objects that I’ve painted and used for scenes so far. (Sorry for the phone pics, original file is 66mb)

I can use generic objects like wood planks as doors, tables, boxes, etc. I just collage them together on different layers and then digitally shade them to fit the tone of the scene.

I can also distort 2D textures into a 3D perspective with the same object. The flat perspective wheel on top is the original painting while the 3/4 perspective wheel is digitally distorted and modified from the original.

I’ve been painting backgrounds and objects over the last 7 years and just digitally archiving them. The prep work took the longest, but now that I have a system, it’s made making pages so much easier.