Athens - the Smalltalk graphic framework that is now also part of upcoming Pharo 3.0 is also available for Amber Smalltalk.
So you can write your graphics code in Pharo first and run it later in Amber directly within a
A demo is here. You have to move the splitter in the middle of the helios IDE to see the "do it" button.
Hopefully Amber and Pharo will continue to stay as much as possible compatible - then you can freely choose the appropriate platform for writing server side (Pharo or Amber on node.js), rich client (Pharo) or webbrowser (Amber) code in Smalltalk.