Vexel art is a digital art that is an entirely pixel-based form of raster art that imitates the vector graphics technique, but is distinguished from normal vector graphics or raster images.
“Vexel” itself is a mixture of two words ‘Vector’ and ‘Pixel’. Vexel designs are composed by using multiple layered shapes. It can be done in Photoshop, but vexel designs are not limited to only Photoshop; essentially, it can be done with any image editing software that has a good Pen Tool.
Great examples and tutorials.....Well worth a look.
Vector-ific!!!!! 
Beautiful Examples And Tutorials Of Vexel Art 
