Gouache on paper.  3x6.5 inches.
 
I found a great price on a small pad of Fabriano paper at the local art supply store, so I had to go out and try it!  Was also trying out a Chinese calligraphy brush because I was interested in different marks to make, but the hairs absorb too much water. You want a gouache brush that doesn't soak up too much water when you use it.