I spent a good chunk of May and June drawing and then coloring Zentangle patterns from Sandy Bartholomew's great book Totally Tangled.
I had a very busy spring so it was great to just work on a couple of tangles each day in May, and then I went back and colored them a little at a time in June, using a combination of Letraset markers, Twinkling H20s and Prismacolor pencils.
I also did a Spring Tangle spread that was a bit more organic:
Little by little, I'm filling the pages! You can see other tangles & resources in my previous blog posts here and here and in my Flickr photostream.