I've never seen pink Manchester United wallpaper. How about asking a family member or friend to help you make the logo pink (or to whatever design specification required) and put it up as a nice poster?

why dont you try to download an image and then copy and paste a different colour over the top instead of having it all over the walls you can then maybe have a white wall with them scatterred over them at least she doesnt have to put up with it when she grows up or doesnt support them anymore