Stripped walls can be used on SOME OCCASIONS... If the house/building design is retro, the stripped wallpaper looks more vintage, if the colors go right. However, they usually don't look right. I use them a few times, but not in every room in my houses. I'm building a house at the moment, the kitchen and the lounge has stripped wallpaper. Sneek peek: 

Note: Only the kitchen and the lounge have this style, everything else has it's own solid color.