This is a great ideea 
Some Ideas
- It should probably have an introduction to OS - to the history - this talk about it is somehow … funny and maybe x mas like.
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Cool could also be that behind one window you find download links to useful open source source software like the Mozilla Browser, Thunderbird, VLC, Inkscape, Audacity, Libre Office
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Another Idea could be to have a simple recipe for baking Christmas cookies. Yes. That is open source. Pretty easy to understand, eh. (I mean in general funny tutorials to anything … are cool.)
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Alicia Gibb has a video talk explaining Open Source Hardware. I remember, that she used children sharing knowledge as a metaphor for Open Source Hardware. Which is a nice idea. Probably good to check the talk again, 2012. On the OSHWA page they have a quick reference guide for Open Source Hardware and some other resources available as well.
- Here is a Open Design furniture Family. Maybe interesting to cover that aspect. http://creativeregion.org/download/familie-binder-howto/ (BTW. the whole book Open Design Now is online and open by now I think.)
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hm, there is a lot, what to integrate? Have a look at Sams Slide from his OSCEdays Pecha Kucha Talk. There are a lot of open-things worth mentioning.
So the whole thing is probably not about beeing complete but about having funny and nice examples.
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One thing, that probably should be integrated is Wikimedia Commons. The worlds biggest archive of open images, videos and soundfiles. Wikimedia Commons
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Another thing, that could be mentioned is “Screws”. Screws are Open Source and an Open Standards! Everyone will understand screws. As well as a drill. And you can deliver that stroy with a link to Open Structures and inspire people to drill holes in everything with 4cm between the holes and then screw everything to everything from everyone.