Why does my urine have a blue tint?

So, like I said, my urine has a light blue tint to it. It's never been like that before, its normally just a typical yellow color. Does anyone know what may be causing it? The only thing I can think of, is my sister got me a new Tea Maker for my birthday, and I have rediscovered how much I love sweet tea. I've drank 3 quarts of sweet tea for like the last 3 or 4 days. I know tea can dehydrate you, matbe thats it, but I really doubt it because I normally drink a 2 liter of Dr. Pepper every day, and it's never happened before. Just to be clear, my urine is almost clear, with a blue tint.