HELP again! Removeable wallpaper coverup!!!

It's that rental rules dilemma again! We love the house that we found to rent while we settle into our new home state, however we just found out that we can't use nails to hang things or even paint...there's a bright blue bedroom (like the question box) and wall paper in the entry that does NOT go with our belongings. I may get approval to paint the blue room, but is there any way to temporarily adhere another wall covering over the existing wallpaper?
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