Where can I find men's shirts in prints?

And now for something completely different.

I’m looking for a long-sleeved cotton shirt in a nice print—not solid, not plaid or striped, and not in one of those tiny patterns that make the whole shirt look like they’re vibrating and hurt the eyes. Something leafy, something paisley, something geometric perhaps, though not gaudy and garish.

If I were a man, I would be so sick of plaids by the age of twenty that I would probably avoid straight lines for the rest of my life. A nice plaid is great, and I love a fine tartan, but please, let us have some variety when we opt for a little color.

Can you recommend an online source that has designs and styles with some color and imagination and that wouldn’t look completely ridiculous on an older man?

I used to solve this problem with my sewing machine, but now I have to rely on the creativity of others.