There are contexts where a design needs to represent several items, each with inconsistently sized images. One example might be a customer database, where the customer's logo is an identifying feature. These can be very difficult to design for.
Are there any common design 'tricks' for ameliorating the irregularities caused by variations in image size? Any visual elements that reduce the effects of the lack of alignment, or that decrease the impact of gaps caused by rigid grid systems?
For instance, I've seen some designs that handle this by randomly rotating and layering the images for a 'photoboard' effect, but that only works well in particular circumstances.