The phrase "beautiful colors" means that something has attractive and pleasing hues or shades. It suggests that the colors are visually appealing or nice to look at. Full definition
She has a plush coat with beautiful colors of cream, black, and some white. (gsgsrescue.org)
The clothes are marked in beautiful color combinations with exclusive impressions which appear traditional and depicts the Pakistani culture as well. (stylesgap.com)
This wrap not only comes in beautiful colors / prints but is made to get wet! (lactationlink.com)