I'm mainly into classic martinis these days, but once in a while enjoy a Vesper or a vodka-vermouth cocktail. Last night I got in an experimental mood and tried a mix of equal parts gin (Sapphire), vodka (Russian Standard) and dry vermouth (M&R), with a healthy squirt of orange bitters. Swirl gently with ice, let sit a few minutes, pour. Really tasty!
Not a martini, obviously, but definitely a cocktail. Unless anyone has heard of this and has a name for it, I'm going to just name it after myself and call it a Bobtail.