I came up with these yesterday and they were a hit!
1 box of brownie mix and eggs, oil, water per package directions
1 cup of M&M's
Sweetened coconut flakes
Preheat oven to 350. Prepare brownie mix in a bowl according to package directions. Add M&M's and a few handfuls of coconut. Spray the bottom of a 9x13 in dish and add brownie mixture. Bake 25-30 min or suggested time on box. After brownies have cooled, frost and sprinkle with additional coconut.