The Browns in Your Compost
Great things to use are dead leaves, grass clippings, or any yard waste: paper; and cardboard. It might be a good idea to shred these items before composting and make sure you keep a 2:1 ratio of browns to greens.
The most common sources of carbon people use in their compost are dead leaves, grass clippings, twigs, or any yard waste that is dead. This is great during the fall when there are an abundance of leaves which you can also store for later use.
Paper is also a very commonly composted, especially if it is shredded or soiled from something. While paper can also be recycled, we have an entire article over whether composting is better than recycling which you can check out. Paper towels should especially be composted as they cannot be recycled however make sure they are do not contain chemicals.
A very common source of cardboard that is used in composts are pizza boxes. This is because pizza boxes a very common use of cardboard however are many times coated in grease leaving them non recyclable. However they can easily be composted and so can most other cardboard items.