This is exactly the kind of plugin i have been searching for... but i cannot for the life of me get the plugin (The Image Wall http://wordpress.org/extend/plugins/image-wall/ ) to work.
Here is a link to my site where i have placed the shortcode.
H shortcode I used:
[image_wall image_sizes='thumbnail, medium' column_width='305x' batch_size='50' buffer_pixels='2000' support_author='false' move_to_end='false' column_proportion_restrictions='2.0' open_links_in_new_window='true' include_categories='' exclude_categories='upcoming event, event news' background_color='black' gutter_pixels='8' corner_radius='8']
As you can see it displays a just a thin black line or box, the plugin has also created the large white gap at the bottom of my site.