We'd really, really love to see an inspiration board builder similar to the one found here:
They host a selection of images as well as the boards. Users can select from a variety of layouts. Pretty nifty. It would be even better if users could bookmark images (like with Pinterest) from around the web, too.
We'd love to add this feature to one of our projects for our paid subscribers. Perhaps someone has a suggestion for an existing plugin that could be customised to do this?