Yep, that's the wall right next to Ethan's bed. Covered in boogers. So apparently as he's falling asleep at night, he picks his nose and wipes it on the wall. Awesome. He also picks his nose during the day and wipes it on whatever is close - carpet, wall, couch, Mommy's shirt (never his own), etc. We're working REALLY hard on using a Kleenex; hopefully it will catch on soon.
So watchout next time you're at our house - you might be sitting on boogers!