I have seen so many amazing, easy-to-make garlands in blogland lately. The creativity never ceases to amaze me... here are some more ideas I've saved and keep looking at:
I love garlands hung in less-traditional places (and made out of things just about everyone gets in the mail this time of year).
This one is a little hard to see... but it is feathers and lights in little drapes. This is definitely something that could stay up throughout the winter.
Maybe try this instead of cramming all the ornaments (which I have a lot of) onto the tree... or into a storage box.