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.
Minimalist Christmas tree alternative for small home. Get some tree branches and pop them in your favourite vase. No room for a big vase and branches? Do this on a mini scale, with rosemary, a small jug and mini baubles!