With a Scandinavian "open" aspect.
bread or biscuits
The avocado was a bit sad, but I ignored the icky bits.
I only had pre-sliced cheese, and the pack had been left open so it was dry and curled at the edges, but it did the job.
Of course this would be perfectly fine without the bread or biscuits, they're really only a vehicle to prevent sticky fingers.
This suggestion came from a comment on a thread on G+. Thankyou! I've been assured that tomato, vegemite and cheese is also a great sandwich filling, but I have yet to try that delectable taste sensation.
Further suggestions are welcome!
Addition: One excellent breakfast or lunch suggestion which I've adopted is:
a wedge of tomato on the side
and handsomely topped with a sprig of parsley
drool ....... :-p