Here are some pictures of pre-Cambrian fossils

Modern stromatolites from Australia:

Fossil stromatolites from the Proterozoic

Section of fossil stromatolites showing the layering pattern:

Fossil cells from proterozoic stromatolite

Fossils of individual cells from the late Archean

A, B, and C are fossils from ~1.2 billion year old rocks.
D, E, and F are modern red algae of the genus Bangia.

Dickinsonia (small):

Spriggina:

Tribrachidium: