Absolutely fantastic for wormery bedding providing it's free of coloured ink. Soak overnight before adding. Also suitable for composting in a hot or cold heap, especially if you have some high nitrogen materials to compost - shred before adding.
Suitability for compost bin or wormery varies. See cat poo.
Cat poo.
Cats are subject to infestations by Toxoplasma gondii. This microbe has the potential to cause brain damage to the unborn child and it is recommended that pregnant women, small children and those with impaired immune systems not handle cat faeces or litter. Toxoplasmosis produces varying symptoms in other people and is often asymptomatic. Many people say that while it is unwise to put compost containing decomposed cat poo on vegetable gardens, it is OK on other parts of the garden. This may be good advice, but as anyone who has a cat and a vegetable patch can attest, keeping them away from freshly dug earth is nigh on impossible. There is, therefore, a fair chance that if you have a cat which is infectious (and it seems this is by NO means all of them) the soil in the vegetable patch will already be infected. Always wash thoroughly any vegetables harvested from a vegetable patch.
If you have access to chaff, it's a very concentrated source of carbon and so may be excellent for people who want to compost kitchen scraps and need a lot of carbon on a regular basis to do this.
Cheese (mouldy).
OK in a compost or wormery in small quantities. See fat.
Chicken carcass.
OK in compost or wormery in small amounts. Will take a long time to break down in a wormery, return to compost if necessary. See animal products.
Chilli.
OK in a compost bin, not suitable in a wormery.
Citrus peel. For nitrogen.
Suitable in hot or cold compost heap. Not suitable for wormery, citrus oil is too strong for worms.
Coffee grounds. For nitrogen.
OK in a hot or cold heap. Really good worm food.
Coffee filters (paper). For carbon.
Suitable for hot or cold heaps if shredded or for wormery.
Comfrey. For nitrogen, potassium, calcium and phosphates.
Because of its high nutrient content it is supposed to act as a starter, helping to get the composting process going.
Corn cobs. For carbon.
Very slow to break down in a compost. Shredding or cutting with a sharp knife will help before throwing it into the kitchen scrap bucket. Can be composted, but might need to be sifted out and returned to next batch when compost is harvested. Worms might struggle.
Wormeries 
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