I've been doing a bit of custom work lately so here's a great example. This is the Vintage Overdrive - a DOD 250-based overdrive with a separate dirty boost. It's a 70's grey-box 250 spec with more gain and switchable clipping diodes.
This pedal is one of one, custom-built for Steve "Vintage" Vlaminck of Media PA-based R3. (http://r3band.com/) . I like it so much I'll be adding it to the official roster as the Wee Heavy Overdrive. Stay tuned.