A collection of opening prayers can be found on the RockHay.Tripod.com website. They were compiled by Pastor Peter Haynes of the Long Green Valley Church of the Brethren in Maryland. Many were written by the pastor, though some were taken from other sources.
Pastor Haynes explains that opening prayers are the beginning prayers to start worship. Most of the prayers on the site stand alone as a single opening prayer. Also included on the list are responsive prayers where worshipers respond in unison. Links on the page lead to other collections of prayers for special occasions as well as scripture quotes and references.