A sliding door effect can be used what the site offer. About a week ago I visited a site called auroraos, on the first page I see a nice sliding image gallery on the front page, it used JQuery to creating the effect, it like a vertical accordion, sliding door effect or whatever you called it.All the images must have the same size, in both width and height, the hovered images will shows entirely, and the others will mostly hidden.
Accordion Gallery