And just because the tree is gone doesn't mean greens can't stay. Wreaths still work, especially if they are smaller and can be placed strategically. These add color, texture, interest, and life to the bookshelves - without feeling like Christmas. Even the ornaments look nice and not too Christmas-y because of their colors.
And despite their color, pine cones and nuts in their shells can add texture and interest to your decor, especially when placed in pretty or unusual containers. If it looks a little dark, a touch of bittersweet or holly berries can add color.
Yes, it's a long time before we see color and light outside our windows. So keeping a bit of the holiday in our homes might just be the tonic we need.