Most bars and islands are nothing more than base cabinets or a taller bar cabinet with a counter built on top. It may include water or electicity. It is a great DIY project because you can buy prefabricated cabinets and buy, make or contract for the counter top. Go take a look at displays at cabinet retailers or home improvement stores for ideas, then take measurements and decide on a compatible style and go for it. The cabinets that make up the island can be moved around and experimented with up to the point you attach them to the floor and each other. You will probably contract or buy pre-fabricated counter if you don't have tools, but you will still save.