Why not get a sheet of zink and cover them. (Looks great) See it as I thick bit of cloth. make a template out of paper card ... don't even need to really! cut it to shape with tin snips. Some mastic.. Bend it over at the front then use some galvanized nails. Probably need about 8. You can do it. :-) or get a builder to make you a concrete one. Polished up they look niiiiice. Some nice colored concrete out there.
thanks for the suggestion