I use paper with straw on top of it. Most newsprint, B&W or color, is vegetable-based these days, but check with your paper folks (it often says something to that effect somewhere in the newspaper). Stay away from the glossy inserts.
You do want to give your soil a chance to warm up before putting down the mulch and you do want to wait for a relatively calm day. I don't water the paper down, but do put the straw on top of it right away. Otherwise the paper will blow away with the slightest of breezes. At the end of the season everything can be tilled in.