If you have limited space in the kitchen, then having kitchen island with sink is a good idea. Now what you need is the design of it. You may see your interior designer to help you with the design. Meanwhile, you may search images in the internet to see the real shape of kitchen island that might be suitable for your kitchen.
There are many shapes and colors available for kitchen island. You may have it curvy or river like. Remember to adjust the size. It really depends on how you will function the kitchen island with sink. Do you want to use it only to wash your hand and put the cooked meal before serving it on the dining table or more than that?
Some people really make use of the kitchen island to the optimum. They use it as a storage, dishwasher, wine keeper/refrigerator as well as dining table. If you plan to do this also, you will have really relieving space in your kitchen. You will be able to give more décor without losing the harmony of the kitchen.
Putting a vase of flowers may sweeten the atmosphere of your kitchen, especially if you decide to use your kitchen island to be the dining table for family.