Our new sim, Whimsy (Yes! We have a sim of our own! Dreamland was not big enough for us!), is under construction, and Xubi thought we should have a sign to alert visitors and a hard hat to protect their noggins. So Chey made a Whimsy Hard Hat (free at the empty point), and made an animated sign.
Chey vaguely remembered reading something about bringing animated GIFs into the world, so she did a Google search and found this web site: http://www.peregrinesalon.com/anim/. It converts GIFs into textures that you can import into the world, and gives you the code for a script for animation. Easy to use. See the Whimsy sign and grab a hard hat at the entry point.
Photo: Chey find the hard hat useful when parachuting.