A Column definition class which renders color. I have used Ext.ux.colorpick.Field. Nothing special, just extended the ‘Ext.grid.column.Template‘. It is also possible to implement using widget column nut I prefer the simplest way always.

The Color column has a following view. You can change the color view div box style to your design or/and add some dynamic visual properties.

 

and the usage in column model:

 

Fiddle Link