Shining Stars - simple tape design tree, with star garland. Washi tape would work well for this, as it wouldn't mar the wall paint. I just picked up some wide white washi tape, with "Merry Christmas" printed on it.
Crafty Christmas Cheer–Spin yarn into a wreath with pop appeal. To craft this door adornment, wrap Styrofoam balls (in two different sizes) and a Styrofoam wreath form with colored yarn. Then use a glue gun to affix the balls onto the form.