Practicing what I preach, I downloaded and installed MacLampsX 2.0 and X-MasTree 1.2, both mentioned in, and available from http://ppcluddite.blogspot.com/2013/11/putting-christmas-spirit-on-your-mac.html. The picture above shows these two apps executing on my PowerMac G5 Quad, under Tiger. A very nice, and a very festive effect!
The Holly and the Christmas lights around the edge of the screen are courtesy of MacLampsX, and the Christmas tree is of course courtsey of X-MasTree. Both are enormously configurable – what is pictured above is the way I configured them. However, you can make the lights blink or not blink, you can use custom bulbs, you can control which color bulbs are shown, and so on. The Christmas Tree is similarly configurable.
Decorate your PPC destop with MacLampsX and X-MasTree!