I like nautical outdoor wall lights, they are really good at mood setting and are a great conversation piece - particularly if you live near a beach.

Outdoor hanging lamps from trees are simply lovely. 

Outdoor wall lights that point down or up the wall (called "wash lights") are spectacular. I very high recommend these in a row along the wall.

I put a series of post lights (about 2.2m) in my garden, some black and some dark green. My enture beighbourhood loves it.

I would say that you should use warm white outdoor lights - much better for mood lighting that cool white or daylight white.

String lights (also called fairy lights) are fantastic for creating atmosphere. They can be put against your house, around trees or even parallel to your path. Beautiful.

Consider using spike lights. They are quite subtle so pretty good with mood lighting. Mine are solar so have zero maintenance costs.

Up down lights I think provide stunning effects - it's why all the mansions use them.

If you have a pond or a water fountain, put waterproof lights in them.

Also ground lights (particularly next to trees) are great.

Solar spike lights and spotlights are great for mood lighting - specially as solar lights are never too bright to conserve the battery. You will be the envy of all your neighbours!

I love classic wall lanterns on outdoor walls. Because of their height, they not only provide great mood lighting but also work well for safety and visibility.

Spotlights directed at your garden or other outdoor features are brilliant for creating a wonderful mood. You can point them precisely where you want them.