One of the most important components of a sustainable party is what you serve your food and drink in. If you compost there are more and more options becoming available. Many of these items are made from corn and are biodegradable in a compost bin. It should be noted that this works best if you compost large amounts and are able to maintain a fairly warm mixture.
While paper plates with food residue cannot be recycled, they can be placed in your compost. If you do not compost, you may want to avoid paper plates and look for plastic plates and cups that can be rinsed.
Another option is to use plates and glasses that can be run through the dishwasher. While this uses hot water and extra energy, it is far more preferable than using items that will end up in a landfill.