I am loving these decorative papers from PaperSource, which happens to be in my "front yard."
They are all 191/2" x 27" and range from $3.00 to $20.00 per sheet. I would love to group the three French Shell papers above my couch. A shot of color, but not a huge investment for an apartment.
This fish one is actually very pretty in person.
This marbled one with pinks, oranges and grey is beautiful.