It would be great if we could mark collections as favorites and put them into our own personal groupings. For example, if I were often needing images of cars for one customer and images of children's puzzles for another, it would be nice to find a lot of different collections that focus on these types of images, mark them as my favorites, and group the collections by type. It would sort of be like having lightboxes for collections. The advantage over traditional lightboxes is that the number of images would grow with-out my actively adding them since the collection owners often do that.
While I'm talking about collections, I would also love to see the following: * Dates of when the collection was most recently added to (right now, the search only shows when they were created -- I have no way of easily knowing if they are active collections) * Better searches and categories for collections * Featured collections -- Reward those users who put a lot of effort into finding good images for their collections by featuring them. It gives them exposure and it would help designers find groups of similarly themed high quality images. (This would especially be good for designers if the ability to mark, save, and group collections as mentioned above were in place.)