Reading the docs I can see that you can conditionally change the recipient of a webform email based on a field value, but that's not quite what I want to do. I want to modify the content of the message based on a form input. For example, based on a webform field like:
Favorite Color:  Blue  Yellow  Red
Upon submission the user should receive totally different email messages saying either:
You probably like the sky...
You probably like bananas...
etc. (you get the idea).
Note: it would be clever and would solve this minimalistic example to create the options like
the sky|Blue bananas|Yellow
and then use their tokens, but that's not an option in this case as it's multiple paragraphs of text I want to be different in the conditional messages.