Rocks or artifacts?

[mikecando]

A friend wanted me to find out if any of these items are artifacts.

[tomclark]

rock
  ..........

[wmwallace]

Looks to be a geofact or an atypical river rock. Neat looking none the less but not an artifact. Thats just my opinion.

[CliffJ]

Not an artifact, it looks like a river cobble millions of years old.