Check out the prize winning Bull Elephant Blend earlier in this forum. It will give you a good place to start. The MM in the blend certainly adds something without being overpoweringly 'interesting' as I find it as a single origin.
I've used Amanda's base recipe without the robusta (I can't bring myself to buy 2.5kg of green robusta!) and it was very nice indeed - both as espresso and with milk. That reminds me, I must try it myself again soon ;-)