There are endless choices of upgrades. The most popular one is the cap molding on the top of the rail. You can end your step rails with volutes or lamb's tongues. The photos shown here are a small array of styles you can select.
Molded Cap 3/4" Pickets Standard -ALUMINUM
Hammered Bowed Picket Closeup
Hammered Bowed Picket
Horizontal Railing - small flat bar
Horizontal Railing - small flat bar close up
Picture # 2 Bowed Pickets
Classic Circle Look
Aluminum Railing - Look under Commercial
Wall Bracket - Upgraded
Upgrade Trim and Collars
Collars and Molding
Mississippi Bronze Core Drill UPGRADE PANELS
2 1/4" Molding 3/4" Pickets 1 1/2"
Double Bar - Scroll with Channel & Molded cap - 3/4" Pickets