Lots of Dots Blanket by Jellina. The details are in Dutch but the Circle Square pattern link has a universal crochet chart. I do like the bright spots against the neutral base. http://www.jellina-creations.nl/2/post/2012/01/a-granny-a-day-15351.html
Crochet Polka-Dot Baby Afghan More
Happy Colours Blanket tutorial by Just Do. Happy indeed! The tutorial explains how to make the small and the large circles, and how to make them into a square.
Basic hex tutorial. In British crochet terms. British treble = American double. Love the pop of color