Time: A time lapse of an hourglass could work rather well, especially if it was a close up of the bottom of the hourglass. This would show the sand building up over time and could be a unique perspective of the subject.
Better Black & Whites - not all black and whites are created equal. In photo editing programs, there are a lot of different ways to create black and white images and many variations within those methods.
Horizontal, black and white photos are custom framed in vertical mouldings with super long matboards. Just goes to show - don't let the orientation of the art determine where it will and won't fit. Anything's possible with custom framing.