Here are simulations of Up and Down Quarks:
 

NOTE: Blue = x-component,  Red = y-component,  Green = z-component


            Red/Blue images have the electron spin axis in/out of the page.
           Green/Red/
Blue images have the electron spin axis up/down the page.

Up Quark wave-function (spin axis in/out of page)   :  +2/3 electric charge

Down Quark wave-function (spin axis in/out of page)   :  -1/3 electric charge