I see a simple solution to this:
- Crafting sticks in a 2x2 shape will give you composite wood
- Composite wood can craft doors, trapdoors, etc and has a hue in-between Oak and Spruce.
- Composite wood's doors and trapdoors would have a simple, generic feel to them. The door would be a bland flat door possibly useful for closets and bedrooms/bathrooms where something like Dark Oak or Spruce would look off.