Night of the living maps
The clipart should be something with: roads, vector data, manual work, survey, tracking, tracing, markers, navigation, globe or zombies. (You can create remixes from existing clipart for these tags)
They need some clipart for a banner along the wiki page ( guess something like 600px width) and for printed flyers. Others (mostly faces I think) are used for our wiki userbox template the twitter account and so on...