Forget the horse, just give me a king DOM

So here's the problem. You start a VXML session and set up all the application scope variables you'll need for the entire length of the application. One of these application variables is an array of colors the recipient likes. On a subsequent document in the application, you need to create a grammar that asks the recipient what their absolute favorite color is. You'd like to create the grammar based on the application variable described earlier, but alas you cannot.
Of course in HTML one could do this using a combination of JavaScript and DOM manipulation. So should something like this be possible in VXML?