Brighten your 4th of July festivities with mason jars of sequentially fading strands of red, white, and blue LEDs. Mix up the colors for other holidays.
Adafruit’s Fona microcontroller, with a GSM phone module, can be used to make your very own dieselpunk cellphone that can make calls and store contacts.
Make a mold and use resin to cast colorful copies of your records. You will have to be careful, and have fast hands, but it's easier than you might think!