What are some options for outdoor LED lighting?

Absolutely. In fact LEDs are a major development in all types of lighting. Outdoor LED lights provide bright light at a fraction of the energy used by traditional lighting. It's safer too, since there are no moving parts to break, Mercury or other toxic chemicals in the bulbs and emit no real heat. Great for dealing with extreme weather. Using a low voltage system (12V or 24V) will also allow you to install a system without the need for an electrician. They come in a variety of shapes, sizes and colors so you can get creative with your design adding color and depth to your garden. There are several manufaturers of outdoor lighting systems with intallation instructions provided. It's not necessarily cheap, but the operating cost and the fact LED lights last up to 20 times longer than traditional bulbs will make the cost over the lifetime a bargin.