In a bowl, combine oats, brown sugar, gingersnaps, flour, cardamom and cinnamon. Add softened butter and vanilla, and mix thoroughly with a fork or your hands until it becomes clumped together. Spray 4 ramekins with non-stick spray, then add an equal amount of pears/pomegranate in each. Layer crumble mixture on top of each pear cup. Bake for 25-30 minutes, or until crisp is golden brown. Serve hot and with ice cream if desired. Garnish with additional pom arils.