You need to have both nitrogen and carbon materials.  Using twice as much carbon as nitrogen will work best.  Remember: the smaller your materials, the better and faster your compost will work.

Carbon (Brown)

• leaves
• twigs (chip large wood)
• pine needles
• newspaper scraps (shredded)
• lint
• wood ash
• sawdust
• straw

Nitrogen (Green)

• grass clippings
• lettuce
• fruit and vegetable peelings
• spent flowers
• coffee grounds
• most kitchen scraps (see list of don'ts)

Things NOT to add:

• meat scraps
• bones
• dairy products (cheese, milk, etc.)
• oily foods
• salty foods
• pet feces
• diseased plants

These could attract rodents and other pests to your compost pile!