For me, by far one of the most stylish illustrations you can get is with a simple ink pen. The result of a nice trace and the inks is simply amazing, like these pieces by French artist Nico Delort. Here you can see a few of Nico's artworks...
This series of animal illustrations were created by the british illustrator Iain Macarthur for an exhibition at the Phonebooth in LA. Most of his work is created by pencil, pigment pens and watercolors using techniques such as geometrical...
ink 
