Shakespeare made up words whenever they didn't exist and he needed something to specifically call an action or concept.
Also, I was watching The Office and they made the mention of creating a word for "when you have a little thing stuck in your shoe".
So, list things that you come across that probably need their own word.
For me, right now: The pictures (like the ones in a thread recently posted) that showcases objects or scenery that accidentally create a likeness of something completely unrelated to the elements of the pictured objects. The whole "Jesus in a sandwich" thing, essentially, though this would extend to more than just facial recognition since bears, characters from movies, and emoticons are frequently showcased as well.