This glass shader is based on Kirado's technique to simulate dispersion in cycles. I edited it so that the colours can be changed. The NodeGroup uses Agus's fake absorption technique so thinner parts of glass are less saturated.
There are other NodeGroups included like a car paint shader using TheFull9Yards's (Conner Addison) technique (I have changed it so you can pick what colour it is), Agus's wire frame NodeGroup and My own checker board Version, and Agus's fake SSS material (slightly modified). I hope the NodeGroups are relatively easy to understand