Here's my contribution to this thread !!
Mine's a Sei Offset Flamboyant 7 string [url="http://www.seibass.com"]www.seibass.com[/url] otherwise known as 'Jezebel'.
I'd wanted a Sei for about 12 years before I was in a position to place the order. I'd met Martin Petersen at one of the music shows and, even though I'm just a regular Joe, he spent time to go over the designs and construction of his Sei basses. From that time, I've never played a bass that felt as good, or that was as well built as a Sei. Come 2006 and I placed the order, a year later the bass was ready for collection.
The thru-neck is flamed maple & wenge and is topped with a birds-eye maple 'board with my signature laser-etched into a mother-of pearl block at the 12th fret. The core of the body is walnut, with a veneer of bolivar which has been dyed claret (which actually looks pinkish) separating it from the full facings of lacewood. Pink is my fiancee's favourite colour so it was great to incorporate that into the instrument. Electronics are passive and are just 1 custom Kent Armstrong humbucker, to 1 volume control. I have basses with active circuits, but I always leave the EQ flat anyway, so I didn't see the point in having any onboard tone shaping!! The bass has an XLR out in addition to the regular 1/4" as well as coil-tap button on the lower edge. Pull the volume pot and the purple LED's on the side of the neck light up.
It's just one heckuva bass !! The close-up pics are courtesy of London-based Graphic Artist, Gareth Jones.