You may be bound by neighborhood covenants and restrictions in regards to fencing.
If you have some creative freedom - you might consider some unconventional materials to give your yard or just a small area some additional character.
The traditional elements for fencing would include:
Wood - easy to work with, strong, beautiful but requires more maintenance than other typical materials
Vinyl - variety of colors and styles, no maintenance, installation can be tricky and cost more upfront
Aluminum - suited for upscale homes. Light weight, less costly than wrought iron and will not rust
Composites - newer option, has the benefits of wood without the maintenance but double the cost
If you have the ability to be creative, you might consider some of these ideas......
Weaving colored plastic slats in a chain link fence
Planting an evergreen vine that covers the fencing within about a year
Old surf boards or skis
Or create a vignette