Shallow ("V") martini glasses... hmmm... There have always been unique one-offs, like this from Crate & Barrel. The classic V shape has also been used for other purposes, like desert bowls. Heck, we even occasionally find things like bird-shaped cocktail glasses and angled glassware. We tend not to like shallow glassware as they spill too easily. I can't recommend anything off the top of my head. You'll have to search around until something shows itself.