Love this idea! I found this one at Urban Outfitters' blog:
U.O. put pinned or taped their lights and decorations directly to the wall. For renters, though, this might not work so well. What I'm thinking is that it would be easy enough to draw a tree on a large sheet of paper or tape several sheets of paper together and then decorate the seams, or cut a tree shape from corrugated cardboard and maybe cover in cloth -- something that could be taped to the wall and taken down with no damage to or holes (no matter how tiny) put in the wall. Up it goes, and decorate away.
I found this Christmas made out of pillows at World Inside Pictures blog (22 Unusual Clever DIY Christmas Tree Ideas). Unfortunately, it linked to a website written in French, but not to the specific post at the website, and I was not able to find it -- so, cite with caution, because I found the same image at several different websites, none of which appear to be the original source and all in different foreign languages:
As a book fanatic, LOVE this bookshelf tree from Swiss Miss -- so clever:
I found another clever use of books or thick catalogs (are there still such things -- I grew up ooohing and aaahing every year over fat catalogs from Sears, Spiegel and J.C. Penney!) at Lush Home, along with several interesting ideas for creating Christmas "trees:"
I found this tree at Organized Clutter blog via Pinterest. With all the unsolicited junk mail I receive, I'd have enough to make a very BIG tree in practically no time at all, and wouldn't have to commit the ultimate sacrilege of tearing a book apart:
December 4, 2016: Hola everyone! Winter has arrived in Milwaukee and there are snow flurries today. Despite several hard freezes remarkably my "spikes" in two of my patio planters have absolutely refused to die. The rosemary and thyme plants I nursed inside the house through last winter spent the summer in their pot outside next to the side stoop off the driveway, where they get plenty of sunshine all day long. I transplanted them into a cozy sheltered spot right next to the stoop in October and they are still green and growing, too! With the delay in getting the drywall patching done in the relatively minor "reconstruction" work I had done in my kitchen, I am way behind my time in getting the house decorated. But yesterday I got my wreath decked out with extra lights and dressed the front door of the house, and my battery-operated traditional candles were put up on the window sills all around the house Friday evening. It becomes a ritual to go around at dusk and turn the tops to the right to turn the candles "on" and at bedtime to go around and turn the tops to the left to turn the candles "off." Today I put some "glittery" throw pillow covers purchased new last month from H&M on three of my sofa pillows to glam things up a bit in the living room and add some sparkle. Later on, after I sufficiently fuel myself up with wine and snacks and probably to distract myself while I listen to the Packers game on the radio, I will huff and puff and pull my artificial tree up from storage in the basement. I will decorate it simply this year. Every year I say that, and every year I end up throwing just about everything except the kitchen sink on the tree. I am very proud of myself this year, though. I did not buy a single new ornament or Christmas doo-dad for the house (throw pillow covers don't count!!!) Happy Holidays to all, with hope and fervent prayers for 2017. I've a feeling we're all going to need a lot of help from Goddess in the coming year. Jan