We have a "Quarter size" file display for images, which uses the panopoly_image_quarter image style. It's responsive, so it always resizes itself to take up 25% of the region it's in. This is great for putting images in articles and floating right or left.

It would also be useful to have a "Full width" file display for images which used the panopoly_image_full image style. For example, a banner image or just having the top of an article be a full width image.