If you own an iPad and you do not have the SketchBook PRO app you are missing out on serious fun. I put myself in a time-out from using it for awhile so I could get my knitting projects done.
But then I had to go over here and read about the whole Zentangle thing and then I ordered the book and Amazon had to deliver it in like 15 minutes and here I am... back in the throes of doodling meditative drawing. When they do the next Zentangle book they need to include a chapter on how to do it with SketchBook PRO.
I better let someone know I am available to author that chapter.