An island is an excellent way to add storage, work space or space to put extra appliances. You could also squeeze in that book shelf or a cheeky wine rack or fridge.
It can be any shape or size, giving you infinite options.
It can have matching work tops, or perhaps a granite pastry slab?
What about a contrasting colour?
But above all, an Island can make a kitchen a very social space, where you don't have your back to people as you cook or wash up.