I've seen recessed downlights that fit in/on the ceiling prior to plastering, then after the ceiling is plastered the light has no visible bezel, just a recess in which the light sits. Search google images for 'trimless downlights' for examples.
Is there a system to achieve the same effect with switches and sockets? The alternative is flat-plate switches and sockets, which is not quite what I'm after.
If it makes a difference to the answer I'm in the UK.