Looking for cool ideas to add to a Vox Tonebender clone (60's version)

[buildafriend]

So far I've thought of adding an output coupling capacitor size switcher. I've only built fuzz pedals and I cant think of what the coolest thing to add would be. Maybe adding a tube after it would be cool? I wonder how hard that would be. Maybe a tube and then a tremelo option? maybe a reverb? I dunno!!