If Im having a banana I will only have one a day, and as they are so gorgeous, I love satsumas at the moment for snacking. Berries are the best to snack on as they are lower in sugar, so if you like blueberries (I personally dont), they would be a great free fruit, or frozen fruits with some ff yog etc.
Trouble with a lot of fruits is the sugar content and it sends your insulin soaring, giving you a sugar spike and perhaps triggering a craving. Cherry tomatoes and sugarsnap peas are a good alternative too, they have a sweet kick. (note to self - follow your own advice!!).