Select wood, natural stone, porcelain tile or other tiles or carpet for interest and visual continuity. Again, look at local and online sources to brainstorm. The base material can be a more simple pattern if the spaces have area rugs. Patterned floors? Simple and smaller rugs. Cozy, small bedrooms are about the only place carpeting is being used at present, but carpet can be cut and bound for area rugs. For large scale area rugs, cut and paste is still used and relatively inexpensive.
Establish walking paths in durable material.
You can change from stone to wood for variety. Or plan rug placement to add interest if needed.