I find old, and decorative, graves fascinating. They are a sign of mortality, and a permanent reminder that 'life is not a dress rehearsal'. I am lucky at the moment to spend quite some time in two particularly pleasant graveyards, whilst walking with my dog Billy.
I don't know if it is usual throughout the UK, but here in Sussex it's not uncommon to find 'Coffin shaped' gravestones at ground level.
Like this one above they are often quite simple with very basic decorative carving. I adore this particular one, and would rather like something similar myself (when the time comes). The lettering around the sides is in Lead, but sadly much is now missing.
This very sad example (above) is by the entrance to our nearby church, and is presumably the grave of a child. The stone is about 3ft 6 ins long, and lies flush with the surrounding brick path. It has no inscription. A very poignant little grave. I think I'll put some flowers on it one day, just to show that he or she hasn't been forgotten.
This one below is very near the small one; maybe they are related.
They are everywhere. Here (below) in another one. Again, no inscription.