Here's what i've done that makes it work:
Code:
pictureBox.Image = Ultima.Map.Felucca.GetImage(0, 0, 32, 32, true);
It just shows the water in the top left corner of the map though :P
The resolution there (32x32) isn't the right one to use to get
I recommend you lower your resolution though.. 272x272 shows like 1/4th of the map (takes quite a while to load)