Me And My Big Ideas

There are quite a few glass panels around our offices that just have what looks like graffiti on them. They kind of look like ideas and brainstorms, but I've yet to see if this is a planned activity, or can you just go up and start drawing a "Kilroy Was Here" type scribble.

PS. I did check that there were no trade secrets here, the most worrying entry is that "I Love Mainframe"!