My favorite was a very large, 5 picture altar piece painted by Frans Schwartz. This thing was probably 35ft across and about 10ft tall. After touring the entire exhibit, I actually went back to his painting and spent maybe an additional half hour or so just looking at it again, and sketched some of the figures from it.
I don't think photos were allowed in the museum, but I grabbed a small image from a local news site of what it looked like on display:
You'd never know it by looking at a photo, but he paints very loosely. If you get right up next to the painting, some of the details in the crowds to either side of the Christ figure, especially the hands, are just squiggles of color. Even in the larger figures, like the two figures of the older and younger Marys on either end, the only thing he really tightens up on are the hands and faces.