Preheat oven to 350 F degrees.In a 12 inch skillet, melt the butter over medium heat. Add brown sugar and stir; cook for about a minute or two until sugar is almost dissolved. Add sliced pears and toss making sure each slice is coated in sugar. Cook for about 8 minutes stirring occasionally and until pears are soft and golden. Remove pears from skillet to a plate and let cool.Mix the ½ cup of brown sugar with cinnamon in a small bowl.Roll each biscuit so that it's about 6 inches by 3 inches. Brush each biscuit with melted butter, then sprinkle with some cinnamon sugar mixture. Using a pizza cutter cut each biscuit into 3 long strips, each one about an inch in width.Start rolling up one strip in the center of the skillet. Surround the coil with slices of caramelized pears. Continue coiling with remaining strip and pears, one coil of dough, surrounded by a pears.Bake for about 30 minutes or until golden brown.While baking make the vanilla icing, by whisking all the icing ingredients together. Allow the cinnamon roll to cool before drizzling with icing.