This photograph from ara133photography's shop is such a beautiful shade of blue that is would certainly brighten any space. If you have a neighborhood association that may look down upon you painting your own door such a gorgeous shade, I suggest you do the next best thing and check out ara133's shop: http://www.etsy.com/view_listing.php?listing_id=18384370.
This painting from Chaanda's shop has such amazing colors that it immediately caught my eye. It is a part of a series that she has done and it can be found at: http://www.etsy.com/view_listing.php?listing_id=10588360
If you don't have a green thumb, here is a wonderful way to bring a colorful bouquet into any room. This piece is from reniebritenbucher's shop and can be found at: http://www.etsy.com/view_listing.php?ref=sr_list_8&listing_id=19409796.