Modular Home Prices

i just bought a new modular home and the walls are not finished sheetrock – instead they are sheetrock with a type of "wallpaper" on them? whats the best item to use to hang pictures, sconces, etc on the wall that will not mess the wall up? the walls are white with a tiny brown stripe that you can barely see
I do not have the sheetrock strips on the wall. i have the seamless wallpaper!

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