Here are a couple of different topping ideas you could try.

Rocky Road
2 cups mini marshmallows
1 cup semi-sweet or milk cho chips
1/2 cup chopped nuts
Sprinkle HOT brownies with marshmallows, chips and nnuts. Place under pre-heated broiler and broil until golden brown. Cool.

Mint Glaze
1 cup cho. mint chips
2 tbsp butter or margarine
1/4 cup icing sugar
1 tsp water
Melt chips and butter over low heat. Spread evenly over cooled brownie. Combine icing sugar and water, blend well. Drizzle over brownie surface.

Hope these help you.