HOW TO – Computer-controlled music-synchronized flashing tree lights
Great holiday Instructable! “Use solid-state relays to blink the lights on your tree in time with music. String lots of lights onto the tree. Use as many sets as you like, but arrange them such that there are three light regions, each with a separate plug. Run these three plugs down the trunk so they can easily be attached to the light controller. Up to three strings of lights can usually be linked in series, so you can almost certainly cover even big trees. Plug light strings into the controller you built for Halloween (MAKE 03). Attach computer and sound system…” Link.
Ray and Cape write “We thought it’d be sweet to make shot glasses out of ice. There are some bars in Europe and Australia which are made completely out of ice and kept below freezing, we didn’t go that far but these are pretty cool (no pun intended), check it out. We used Dixie cups. They come in several different sizes. You will need two different sizes, we used 9 oz and 3 oz cups…” 
Escher’s “Relativity” in LEGO! “…our fourth Escher picture rendered in LEGO. Once again, no camera tricks, but the picture has to be taken from exactly the right place, and boy did we get tired of trying to find where that place was. The whole thing took five or six evenings spread over two or three weeks. Most of the last evening was taken up with setting up the lighting the way we wanted it and trying to get the camera position just right…” Thanks Techhat! 
Nice mod if you have an old Dreamcast laying around, Raph writes – “The image on a TV is always a little too blurry for my taste, and the quality of a VGA image is very superior. I had always dreamed to be able to use my SNES on a PC monitor, but the SNES did not have a VGA output. When I learned that the Dreamcast could output a VGA signal, I installed a VGA connector on it almost instantly.” [
“Radii-a 1950s-style radio with Internet content – a box with buttons and dials used to select bands and tune stations in a familiar way. Because this radio receives Internet radio, it provides hundreds of noise-free stations with a wide variety of listening options. The band selection dial, instead of AM and FM, is used to select genres such as News, Sports and Rock. The station selection dial scrolls through station names that can be tuned by clicking the select button.” Thanks 
This is a great, use an old Palm to control your PC’s music. JT writes “After using several mp3 player thin-clients and other Palm-based Winamp interfaces, I decided to write my own. Basic requirements: Must not require using (and losing) a stylus – Edits playlist order with a single touch/drag – Direct searching Winamp media library and server directory browsing.” 
Here’s something to make when it’s cold outside. Snow! This site has a couple of snow machine designs that can be built from stuff you might already have (an air compressor, a high pressure sprayer, various plumbing fittings). There also has a page describing the physics involved in snow making. Thanks J. Wolf! 