I don't think it's likely that I damaged it, I was dead tired from a very long day at work, and the ride home is easy, with long stretches where I just coast down a slight incline. If I did, though, I can put the original crank back on it.

I won't have time to work in it today, though I've tightened it down to what should hold it if it isn't damaged, and I've put a spare allen wrench in my work bag for today. Tomorrow I'll probably go about getting my hands on an empty peanut butter jar (My roommates go through lots of pb&j), and I'll give it a quick once-over with black spraypaint (thanks for that idea, Tourist).