We visit this topic from time to time, but it is always a joy. One of my favorite finishes is the chestnut sunburst. One nice feature is that the color difference between maple and mahogany isn't stark. Here are two older instruments. Note how the artists spraying them went for a slightly different result.
I started looking around for shirts and the main thing I got from this exercise is I have way too many t-shirts!
Here are a few but I know I attended more PSPs than this sample. I'll find them some day.