365 days of SL, day 30:
(Click for larger — 1920x1033 PNG, 1632 KiB)
Looking up from underwater in SL will produce a very nice and realistic-looking ripple effect at the surface. It obviously looks better when you're not just viewing a static screenshot, but still, the above'll give you a general idea of what it's like.
For added fun, try to make out who and what you can see in the picture. :) If you can correctly name six distinct things, you get a cookie.
Location: FP Enigma (8, 124, 17)