In Holland a new brand appeared. It's called Aristides. They make a 5 string bass called the 050 and a 4 string one will follow. This bass is made of Arium which is developed by the Delft Technical University in the Netherlands. This Arium consists of glass crystals and natural resins and the idea was to make the 'perfect tone material'. So it's no carbon fibre or something like that, but more an artificial wood, but without dead spots, without quality differences and it's made (molded) out of one piece.
I guess it won't be everybody's piece of cake, but take a look:
www.aristidesinstruments.comBTW: I hope I can do this, because I help this company out with some marketing issues. So delete if I can't do this.