Many of us take a small watercolour palette out with us, be it a 
homemade version or a manufactured one.   By virtue of having a small 
palette, it doesn't allow much room for actual 'Mixing' of paints, so 
I've come up with my version that I find quite handy.
 ~ I laminated a piece of pure white card stock ~
 ~ Makes for a great portable mixing palette ~
~ and is easily wiped clean ~
~ and can be slipped into the pocket of my moleskine sketchbook ~