I'm all for live, green, piney-smelling needle-dropping Christmas trees myself, but if you're not then this Flatpack Christmas Tree might be an interesting option. I'm not sure what kind of home decor this sort of tree would look best in -- I'm thinking something contemporary, but it's awfully plain and unexciting looking. And how do you decorate it? I have to say I think it makes one ugly Christmas tree, but as a general decor item it could be really cool. Available from Büro North in 3 sizes ranging from 1' to 7.5' it may be eco-friendly but that doesn't mean it's cheap: $1414 for the full-sized version.