Follow the steps below to set the colors for the Color Swatches that will be used for the color selection on the Product Designer page:
1. Go to Catalog -> Attribures -> Manage Attributes and choose the attribute that is used for color selection in your store.
2. Upload the necessary images as shown on the screenshot below:
3. In order to set the same color attribute to be used for Color Swatches on the Product Designer page, go to Configuration -> GOMAGE -> Product Designer -> Navigation -> Color Attribute and set the corresponding attribute code there.