Oranges- You can use a zester to get strips of the orange peel for decoration. Also you can use a zester on an orange to get orange shavings which have some flavor but are mostly used as a garnish.
Limes- You can use this zester to add flavor to your dish by shaving the edges of the limes into your dish.
Chocolate Curls- A zester can be used to make a beautiful chocolate curl garnish. you simple make a sheet of chocolate and then scrape the zester against the chocolate to make chocolate curls
Lemon- You can use a zester to get strips of the lemon peel for decoration. Also you can use a zester on an lemon to get lemon shavings which have some flavor but are mostly used as a garnish.