I use a cheap stick blender and it works a treat. I usually include a ripe banana as a basis, then add some sort of probiotic yoghurt - either an Actimel or the equivalent amount of pouring yoghurt - a handful of berries, fresh are great, but frozen are even better, a couple of heaped teaspoons of jam or honey as a sweetener, a glass of fruit juice and a couple of handfuls of porridge oats. Whizz it all together until smooth and you have a delicious, filling breakfast.
Occasionally I'll add an overripe pear if I have one in the fruitbowl that needs using up.