Mohannad Rawashdeh put together a nice tutorial (archived copy) on using the capacitive touch pins on the Teensy 3.2.

The tutorial goes over how to use the Touch Sense Pins (touchRead) – Pins 0, 1, 15 – 19, and 22-23.  Code for the tutorial, as well as a schematic and PCBs files are available on the tutorial page.