I've had a think and have a feeling I can do it pretty easily. I intend to make a real time particle system that uses systems created with ExGen (it will be up to the user to make it useable in real time) and I can use this to render the textures. It won't be in the first version of the app, but will appear in an update within a month or two of ExGen being released (hopefully - I don't like promising things... just in case).