is there any way to change the colur of my device

If you're within the return window (14 days from purchase for an Apple store), then probably.

If it's been longer than that, then no. What you have is what you keep. You can sell it and buy a new one.

~Lyssa

You can also get a snap-on case in a color you prefer. You can even get several cases and change colors to fit your mood or what you are wearing.