One thing I have been told they could be used for is a coaster. I suspect that if you could plug the hole, it might be okay. But I still think the condensation would roll off the sides, so you would need to put sides on it. I think we should pass on coasters.

How about using them for a mini-frisbee? I tried this for myself. They do not fly right. They are also pretty hard material and would probably hurt when they hit you. Alas, another bad idea.

How about hanging them from the rearview mirror of your car? I have been told that they are supposed to be effective in warding off speed guns and automated speed traps that use flash photography. I guess it is worth a try, until you get caught and find it is just another hoax.

CDs are pretty when they catch the light so maybe that is worth a try. Let's glue two of them together label to label so that we have a shiny reflector on both sides. Drill a small hole near the edge to connect a string (I recommend fishing line). We can create a bunch of these and turn them into a mobile to hang on the deck cover. When the wind blows, you will get a flash of colored light.

A lot of these double-sided reflectors can be hung in your garden or around your fruit trees to scare away the birds. If you drive through Napa, you will see that they use reflectors that blow in the wind to scare off birds. Maybe you can sell them a few cases of these.

A single reflector can be used as the wind catcher of a wind chime. The wind hits and knocks the clanger on the chimes. The CDs would not work for the chime; they would not make a nice sound.

How about using them to kill some time? Use them for rolling contests. The winner is the person who can roll the CD the furthest.

How about using them for stabilizers? Put one or more under a chair or table leg that rocks back and forth. They are quite durable and will not be damaged by water. You could take some with you when you go to those restaurants with outdoor seating that always seem to have rocking tables. I guess that means they will end up in the trash, but at least you will get one more use from them first.

Drill several small holes and use the holes to wire the double-sided reflectors to your bicycle spokes. These will be very visible to cars when their lights hit them.

How about a puzzle? Use a small wire saw and cut the CD into a jigsaw puzzle. Make a gift out of three CDs so that is not too easy to put the puzzle together.

You could be the talk of the party if you walk in wearing earrings made from CDs. As a bonus, you will probably have longer ears when the party is over.

As long as we are talking about things you wear, how about chain mail? Drill small holes and sew the CDs to your clothing and wear it to your next laser tag game. It will reflect back the laser like armor.

Learn how to make a boomerang from a CD. I have not tried it yet but it sounds like a worthy effort.

You can make a nice clock from a CD by adding a clock mechanism from a hobby store (Michael's has them). For general purposes, put the shiny side out. If the CD is your own product, put the label out.

If you have access to industrial-strength paper shredders, run the CDs through them to turn the CDs into colorful chips. You could use them in an aquarium instead of colored rocks. Do not try this on a home shredder or you will end up in the market for a new shredder.

You could cover the walls and ceilings with CDs (shiny side out) and turn it into a disco. All you need to add is a disco ball and colored lights.

Maybe you can make a disco ball from CDs as well. Drill small holes on the edges of the CDs and connect them together in a sphere. Get a rotator from a craft store for around $10. Then just shine a bright light at it. You may also consider gluing the CD pieces from the shredder to a Styrofoam ball.

Use the CDs to try out all of the "helpful CD repair" suggestions you find on the web. Who knows, you may actually find one that works. I suspect that you will go through a lot of CDs before you find a good suggestion.

Use the CDs as targets for BBs, darts, or arrows. You will certainly know when you miss the center hole.

Use them as a backing for round knobs to protect your cabinet doors from being soiled. I suspect that you will be happiest with the 80-mm mini-discs instead of the normal 200-mm disks.

Use caution if you try breaking CDs. They will normally shatter and send pieces all over the place. Be sure to wear safety glasses to protect your eyes.

You can use these useless CD for your own experiments in CD durability. Use your imagination to see how much torture a CD can take and still be useful. You know, scratch the label side and see how soon you reach the metal containing the data. Try different markers and solvents to see which ones eat down to the data layer (give them a week or so to eat away). See if you really can wash CDs in a dishwasher. Have fun.