The site WebUrbanist, a nice blog mainly focused on architecture and urban design, has prepared an interesting article about modern sink and wash basin designs.
As you can easily see, if you've always thought at sinks as white and round things more or less always with an identical shape, you're quite wrong then, because designers have worked much to style and innovate them. The following ones are my favourites:

This is the Ammonite Sink. As you can imagine from the name it has been inspired by those wonderful fossil shells:


The following three instead are serie called Kanera which surface resamble itself a liquid, the ceramic holds water like a seaside rock pool:


Like the prevoius also the third one is nature inspired. Erosion Sink is designed like a geographical map of a drainage basin with its contour lines.


Plugless Sink by designer Maja Ganszyniec is remarkable for its clever design that avoid tha useless water waste you usually have with a normal plugged basin (everybody keeps the water going until they've finished washing hands, tooth or whatever, this way instead, with no plug, you learn to fill the basin with water and use it until you've finished avoiding the waste of tens of unused litres of water down for the plug. Once you’ve finished with your bowl of collected water, tip it backwards into the spillway and you’re ready to go again.


Origin Sink is for sure the most Zen-inspired of the bunch. Lift the stone at the source of the river and the water starts its way down to the end of its journey, a plughole capped by another stone.:


The last one is in my opinion the less elegant and the most kitch by far but for sure it's absolutely original and weird. The Moody Aquarium Sink from Italbrass is infact a sink coupled with a fully-functional fishtank. The soap dishes on either side of the basin are entrances into the tank for feeding and maintenance.