If you liked the idea of designing your own Mawzer controller online, you’ll love this, too: Algorithmic Arts has free Windows programs for designing your own modular synth layouts. (Via a Music thing link roundup.)
Sadly, I’ll have to settle for firing up Reaktor for the soft synth version of this, thus avoiding permanent damage to my bank account and relationship with my significant other (not to mention, the ability to walk through my Manhattan living room). But I’d love to see your dream designs! Heck, let’s just pretend money is no object! (Pictured layout: over five grand.)