The site, still new, could use a few more resources, like clearer restrictions on licensing and usage. The usage section does mention restrictions, but it would be useful to include familiar language from, say, Creative Commons Licenses. It would also be great to have more social media features, to make it easier to share the ideas and inspiration on sites like Pinterest and Tumblr and to build a community amongst contributors.
But either way, iStockPack is a great pool of resources, and as they mention on their site, they're looking for more user contributions. Some contributions, like the ones below, offer extensive directions and resources.
An Xiao Mina is an American designer strategist and researcher who recently worked on the Gwangju Design Biennale's Un-Named Design exhibition. She focuses on the role of social media and communications technologies in building communities and empowering individuals. Find her on Twitter here.