"Vertical Landscape" by Eiko Ojala. It looks like a paper landscape but the artist actually works digitally and hand-draws all the elements to look like they're cut out of people. (Hint: the shadows help!
Pick The Right Color For Design With This Colour Psychology Chart. Businesses often utilize color psychology to increase productivity, but it can also be great for home use (i. determing colors for calming spages for sleep, yoga, meditation, etc)