Yeah, an LFO controlling a blender. I don't know of one ready-made in pedal form, but it can be done. The ready-made units that can do that are either rackmount or software.
Maybe talk to Mario at Robot Factory, I know he's interested in making some new circuits.
I've got an LFO Mod Box from Mario. I'm guessing that in a larger enclosure he could add a blend circuit. Or you could just hook the Mod Box up to the VBX.

