There has always been a tradition of creating new art work for churches to the Glory of God and to enhance the interior of a church.
The Cathedral and Church Buildings Division, Church of England has just published Commissioning New Art for Churches: a guide for parishes and artists (November 2011). This covers all aspects of introducing new art into churches including producing a brief, selecting an artist and the legal necessities. It also covers temporary loans and exhibitions. You can find it at http://www.churchcare.co.uk/churches/guidance-advice/making-changes-to-your-building/commissioning-new-art
For the Methodist Church, information can be obtained from: www.methodist.org.uk/ministers-and-office-holders/property/technical-and-conservation/commissioning-artwork
In addition, the recently-released Beyond the Wood and Stone is a new DVD designed to encourage fresh expressions of church. An initiative of Creative Arts in Methodism and the Methodist Property Office (MPO), this inspiring film shows ways in which local congregations (Methodist, Anglican and Local Ecumenical Partnerships) have created attractive spaces to welcome the communities they serve, which includes a number of examples of innovative use of new works of art. See www.methodist.org.uk/ministers-and-office-holders/property/forms-schedules-and-publications/church-review-publications.