My son and I put together this blinking LED Christmas tree kit, and then hung little MAKE gift subscription and MAKE gift certificate ornaments from it. It was a lot of fun — he got to learn about anode vs. cathode sides of the LEDs as he fit them into place for soldering.

The gift cards and gift subscriptions make wonderful last-second gifts for all you procrastinators out there! You can print out the assets yourself, available here and here.