The ardubracket is an easy way to mount an arduino on particleboard. Simply glue it to the particleboard in the way YOU want, and slip the arduino in.

Glue the ardubracket to the particleboard so a side view would look like this:

| Arduino
|particleboard
|particleboard
|particleboard
|glue
|____

Their should be some loose space on top, because that is where the arduino slips in.
Now, glue the brackets into a shape that will best hold your arduino.

You're done!