Last year KreaturShop designed the Undercover series, but it never was promoted here on the blog. The underlined text "Undercover" is printed in graded colors, and comes in the three color variations gold, pink and aqua. It's available on multiple products, such as make-up bags, t-shirts and other tops.
Most products allow you to adjust background color.
Here are a few examples:
Please click image or text link for product details and a better look.