In a small saucepan, mix together the cranberries, sugar, water, splash of orange juice, 1 sprig of thyme and vanilla extract. Cook for 10 to 15 minutes. Remove thyme stem. Pour into a blender and puree the mixture. Strain to remove solids.Add ice to 2 lowball glasses. Add about 1 ounce of the puree to each glass. Top with 2 ounces of gin and then top with tonic. Mix and garnish with slices of limes, cranberries and fresh sprigs of thyme.