Those of us who have been using Linux for a long time all know the joy of silly programs like xeyes. One of my favorites, however, is good old xsnow. Whether you love the cold weather or live in Florida and like to ski on occasion, xsnow will add some winter fun to your desktop. The xsnow program has been around forever and is surely available for your distribution.
If you're absolutely against snow and all its icy accomplices, you might want to check out a couple other oldies but goodies. Back before we had fancy computer games, we used to waste time with programs like xneko (you'll probably find it now as oneko), which was a little cat that chased your "mouse" around the screen. Or, perhaps you still enjoy the ever-staring eyes of xeyes (or a more modern tuxeyes). Finally, if your time-wasting tastes are a bit more on the macabre side, xroach (or groach) might tickle your fancy with bugs that scurry to hide under the windows on your desktop. Whatever your thoughts on silly time-wasting apps, you owe it to yourself to check out a bit of Linux/UNIX history.