This roof is topped with a finial, and at the finial base is a pendant. Running diagonally from the pendant down the roof are vergeboards with simple cutwork.
A shingled, domed roof has a finial to decorate the peak.
A pointy finial sits above a cone roof (click photo for full view).
Fences commonly have finials on the upright posts.
Finials can be used alone for decoration; these were made with a wood-turning tool.
Even furniture can have finials. These are ball finials.