I like to look goofy on the trail. It helps my friends find me if we get separated for some reason. For example, in the winter, we may ski in different directions for a while. If I wore boring grey and black (like so many these days) I would blend in, but instead I typically have a neon yellow Montbell jacket and a purple hat. In the summer, I like to wear my yellow O2 rain jacket and pants, for similar reasons. The only time I didn't like this "look" when when I was in Europe, as I didn't want to look like an ugly American.
Probably the main reason I still prefer a rain jacket over a tarp is that I can also use it as a bug suit. Speaking of which, when I didn't care so much about ounces, I wore the Original Bug Shirt (http://www.bugshirt.com/). That would get more comments than any of my other gear.