But for a while I have been considering grabbing some out-of-copyright music from Project Gutenberg, and some historical video clips from... well, Google used to have a bunch if I can just find them again, and Gutenberg has a few... and doing a completely legal remix. Just as soon as I have time.
Today I found out about Memory Maker which does just that:
Craft your own expression of what 'Coming Home' means with this video mixing tool. Remix photographs, graphics, film clips, and music from the years following the First World War and then share your new video with friends and family. The Memory Maker is hosted by the Auckland Museum, with members of the National Digital Forum and others providing the unique content.
Being theme-based, the selection of clips is small, and what you can do with them isn't as complex as what you could do in, say, iMovie - but it's an incredibly smooth click, drag and play interface. Head on over to see what videos people have made with it and make one yourself.