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     I got one BlinkM to respond correctly... how about 4??  From the BlinkM manual:

To add multiple BlinkMs to a circuit, connect their I2C SDA and SCL together and run those two lines to the SDA and SCL pins of the I2C master controller. The Arduino is the I2C master. The two 2.2k “pull-up” resistors are necessary to help the Arduino talk to multiple BlinkMs.

       Here is my first attempt @ an electrical layout:

This is me figuring out that I should turn the Lilypad 90 degrees clockwise—it makes a big difference for crossing wires

      In my first drawing I included 6 potential LED spots, because I have 6 BlinkMs. I'm actually going to use 4, which is more than enough to handle, thank you.