Here are some other options, depending on the context:
* A set of feet: This is appropriate for a collection of feet related to a particular person or object (e.g., "a set of feet on a statue").
* A group of feet: This is a general term for a collection of feet.
* A multitude of feet: This emphasizes the large number of feet.
Ultimately, the best collective noun will depend on the specific situation and your desired level of formality.