Rotating bookshelf (or other ideas) (Near Biggleswade, SG18)

I've recently started a library at my church but the books are high up on a window ledge and aren't being looked at as much as I hoped. As we're having a Christmas Tree festival in December I thought a great way to promote it would be to make a 'tree' out of a rotating bookshelf, and then keep them on it going forward so that they're more easily accessed. So if you have one it'd be appreciated, or any other ideas of what could be done. Thanks