Here's how to dress up a fence post with a beveled cap. It's easy to do with a radial arm saw. Set the blade at a 45-degree angle. Before cutting, always protect your eyes with safety goggles. Then make one cut pulling the saw firmly towards you. Rotate the post and make another cut. Proceed the same way with the remaining sides. When you're finished, you'll have a perfect 45-degree beveled fence post cap.
For more on outdoor structures, consider:
7 Top Options in Fencing Materials
Recycled Fences: 8 Ways to Put Salvage to Good Use