And here's the last hidden doodle I have for now, again in an attic. This was in the new building my company bought, and is in the attic in a fairly hard place to get to. I had to go into one section of the attic, walk along a catwalk, climb over and under some ventilation, found a hole to another section of attic where I climbed across some beams to another hidden catwalk, and tucked behind a 2x4!
Unfortunately though, I found that white stuff on the wall was giving me a ton of trouble with the marker, making it quite difficult to draw, but I managed to do it anyway! Good thing I had a good while to slap this one up there! Though I heard my coworker looking for me before I was able to finish, and had to take a quick pic and retreat, though I think I got it done well enough ;3

I'll definitely do more of these in the future, and I'll be sure to show you guys!
BTW, what do you think I should do for the next one? *w*