Do you mean figurative rather than (what appears to us) abstract? Here's a few -
http://www.themodernantiquarian.com/site/11311/goatscrag.html
http://www.themodernantiquarian.com/site/3067/creswell_crags.html
there's axes and a dagger at Stonehenge-
http://www.themodernantiquarian.com/site/609/stonehenge_graffiti_dagger_stone.html
there's supposed to be a couple of axes(?) carved in relief at Boscawen-un but I've never seen pictures of them. For the foot fetishists there's these -
http://www.themodernantiquarian.com/site/3258/pool_farm_cist.html
http://www.themodernantiquarian.com/site/248/calderstones.html
I think there are some figurative carvings in Scotland but the sites escape me at the moment.
-Chris