I started by painting the tray using Acrylic Paint in Pink Melon (similar). It took 3 coats, and I probably could have done more, but I liked the rough finish. Later I may add a clear glossy coat on top to give it a shinier look.
After painting the tray, I decided to add more color by using shelf liner paper that I purchased in an Aqua Chevron print. I found mine on clearance at Meijer but you can find the same brand paper on Amazon, here.
I used the grid on the back of the paper to measure and cut the paper to fit the inside of the tray. Next, I carefully pealed off the back of the paper and slowly smoothed the adhesive across the surface to minimize creating any bubbles in the paper.