Obviously a cove takes some beating, but I can offer a cist lid:
http://www.megalithomania.com/show/image/1210
Christianised:
http://www.megalithomania.com/show/image/1209
Next to a snapped off phallic stone:
http://www.megalithomania.com/show/image/1207
Next to a holed stone:
http://www.megalithomania.com/show/image/1208
All in one church yard.