I can dream can't I?
(http://www.pigtronix.com/images/products/PigtronixMGSsexy.jpg)
Pigtronix makes amazing pedals. If your interested in building an analog synth you might want to explore http://www.squidoo.com/buildASynth. Seems like a good place to start. There's lots of crazy stuff there!
As far as DIY guitar synths go there's the formidable Mudic From Outr Space Sub-Commander
http://www.musicfromouterspace.com/mfosweb/synthdiy.action?PROJARG=GUITARSYNTHAUG2007/GUITARSYNTHAUG2007.html&findProjectMode=BYURI&MAINTAB=SYNTHDIY&CATPARTNO=SUBCOM001
Expensive board, but a good looking project.