Paint Brush

Flex Sensor Circuit - http://www.sparkfun.com/datasheets/Sensors/Flex/flex22.pdf
                                  http://sitemaker.umich.edu/me552f04/files/group3_circuit.pdf
                                  http://www.makingthings.com/teleo/teleo/cookbook/bendsensor.htm#diagram

Capacitance Touch - http://www.extremecircuits.net/2010/05/simple-capacitive-touch-sensor.html
                                  http://www.circuit-finder.com/categories/sensor/touch-sensor/page-1
                                  http://www.buildcircuit.com/modes-of-ne555-monostable-and-astable/
                                  http://www.siongboon.com/projects/2007-11-29_touch_sensor/index.htm

LED Shift Register - http://www.protostack.com/blog/2010/05/introduction-to-74hc595-shift-register-controlling-16-leds/
                                  http://www.instructables.com/id/LED-matrix-using-shift-registers/?ALLSTEPS
                                  http://www.radiolocman.com/shem/schematics.html?di=106943
                                  http://robots.freehostia.com/Software/ShiftRegister/ShiftRegister.html