Think original, real, painted by a genuine artist work is beyond your budget? You're probably right if you're looking to something to fill a whole wall at once.
But, if you love small scale atmospheric paintings, Tina's offering 100 studies she's painted to help her develop her larger scale works for £10 each. She's sold half of them already. Find out more here on why she does the studies and what she uses them for on her blog http://tina-m.blogspot.com/p/100-for-10.html
You can see more of the 100 studies on her flickr stream here http://www.flickr.com/photos/tina-m/ which is where I stole this shot from.
And you can find out about what else she's up on her twitter @tina_m