What people often do is to cut or have cut a rectangular piece, say 2" x 12", to attach to the bottom of the bullnose. So it becomes a rounded edge with an attached overhang. You don't even necessarily have to do that, if you are going for angles--you could just polish the outer edge of the countertop piece and attach the 2" overhang piece on that. It would be an angle, then, as opposed to a curve.

I've never seen crema marfil fade, no matter HOW old it is. As for composite, there are no cons that I can think of, and as for pros, it's not nearly as brittle as natural stone. Beyond that, though, it's pretty much a matter of aesthetics. Re the emperador dark, this should help you envision it:

Renee you must be overwhelmed with all of these comments. Your countertops are GORGEOUS, so I do hope you keep them. Sophie's suggestion to stain the floors is well worth looking into. For what it is worth my suggestion for your backsplash is to go with a simple solid tile in a lighter color that coordinates with the countertop. I would suggest you not go too small with the tile- 3x6 to 4x12 would be a good size to stick with. You want to avoid too much movement in the backsplash as the counter (and the floor) have quite a bit of movement and you do not want them competing. Let the countertop be the star of the show. Good luck and let us know how it all ends up for you.

@Dragonfly - Thanks. My counters are only cleaned with product once a week but if I actually spill something on the counter, I wipe off with a damp washcloth. I do clean up any drips around the sink which occur when I wash my face but actually I do that more for the faucets than the sink as I have hard water and didn't want residue accumulating on the faucets over time. I do use a steam cleaner on the bathroom floor periodically. I have read mixed advice about this but so far it seems to be fine. I don't do anything with the shower floor in terms of cleaning but I hose it down for any suds before exiting. On the advice of people on this forum, I do use liquid shower gel which is what I would be using anyway as I used it when I had the hideous fiberglass shower/tub insert :-). Marble and natural stone can be restored by a professional. I live in a condo with marble floors in the common area. Periodically, my HOA hires a professional stone restoration company which cleans and polishes the floors and also cleans the grout. The floors then look as good as when they were installed twenty years ago.