There are a few companies around doing stock video footage — usually animated backgrounds with various themes. Companies like Feedback Video do this sort of thing, and also do the odd bit of custom ad work for some Canuck digital signage networks.
But I picked up on a regurgitated press release on Digital Signage Today about a company called Motionstream, which says it is expressly in the business of doing stock footage to be used by content producers in the digital signage industry.
Motionstream, a developer of custom and royalty-free content announced the release of Holiday-Maker HD Powertools, a royalty-free library of holiday animation created for retail marketers to help lower the cost of holiday promotion on digital signage systems.
The company is based in New York and, scrounging around a little online, seems to be a collective of freelance animators. The idea is pretty straight-forward. Buy a disc or discs of royalty-free animations and bring them into something like After Effects as the foundation for producing video spots that have some cool things happening in them.
The alternative is getting in-house people or contractors to do the same thing, and taking days and days.