The floor and wall tile in the bathroom of my new house is in perfect contion but it is the ugliest pink I have ever seen. Is there anyway to paint/stain or do anything to change the color? I would hate to have to take it all to change this eye sore.

Sure, you can paint the wall and floor tiles. It's not the most desirable thing that can be done. But, it can be done.

What are they made of?

Sorry I should have said they are a smooth glossy ceramic and I wasn't sure how well paint would stick with getting wet in the bathroom. The wall tiles also line the tub so they will get wet but there is no shower installed so they won't get a constant stream of water on them. Will the steam and humidity cause the paint to loosenr bubble? How should I prepare them and what type of paint would be best? Lowe's and Home depot have so many options I start to over think and get lost. Thank you for your quick answer. :)

There are several Hi-adhesion primers that are compatible with tile. To ensure a good job try to degloss the surfaces first with a Silicon Carbide sandpaper.