Configurable Product Swatches enables switching the product images and prices on the fly. The extension uses the Magento product base images and thumbnails and supports one configurable attribute, one thumbnail and one image per product.
For the images and the thumbnails you can use any pictures per your wish and have them in a size of your choice. Each product may have a different price, which is updated automatically, when you switch between the simple products, this works based on magento's own pricing functionality.
By default, the product image can be magnified with the standard zoom in Magento. Clicking on the "Add to Cart" button will add the product to the cart with the correct attribute value and price.
You can set the thumbnail of the simple product to be shown in the shopping cart on checkout. You can also use your own custom set of thumbnails.
For more in formation click here http://ilovemage.com/extensions-for-magento-16/magento-utility-based-extensions-for-community-enterprise-professional/configurable-product-swatches.html
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Thanks
Monty