Design Work Life is always a great source of cool visuals, including some fabulous sketchbook spreads from a variety of artists:

  
Mette Hornung Rankin’s con­tri­bu­tion to The Sketchbook Project: Things That Stick. 

 
See more at design work life » Things That Stick.

Some work by Nick Iluzada:

 

 
See more at design work life » Nick Iluzada Illustration.

 And this startling mix of color and spare black and white by hold­snowa­ter:

 See more at design work life » Sketchbook Envy.