On different surfaces:
* Bare feet on hardwood floor: A soft, thudding sound
* Bare feet on carpet: A muffled, almost silent sound
* Shoes on pavement: A sharp, clicking sound
* Shoes on gravel: A crunching sound
* Shoes on grass: A soft, whispering sound
* Shoes on sand: A squishing sound
Depending on the action:
* Walking: A rhythmic, repetitive sound of steps
* Running: A faster, louder sound of steps
* Jumping: A thumping sound
* Stomping: A heavy, loud sound
Other factors:
* The weight of the person: Heavier people make louder sounds
* The type of footwear: Different shoes make different sounds
* The speed of movement: Faster movement makes louder sounds
Let me know if you have a specific scenario in mind, and I can be more specific!