Theses are nearly all within easy cycling range of Cambridge. Other image collections are more comprehensive. A googlemap of East Anglian village signs and a Flickr collection are online. Sawston and Grantchester are amongst the places lacking signs.
Few of them have plaques to explain the symbolism. Hinxton's has an easily missed double-helix. Windmills, churches, ponds, Romans and Vikings are popular. Here are some sources of information (parish newsletters, etc) -