Sometimes its fun to try and loosen up a bit, let go and just get kind of sloppy. I have a hard time not stressing over every single line a lot of the time so giving myself a set time limit and trying to just go with the flow can be a lot of fun.
As an exercise to loosen up I made a series of 4x4 squares on water color paper each colored with a different set of Dr. PH Martin's concentrated watercolors and once they were dry I went in with a brush and Dr. PH Martin's white ink and just tried to have some fun.
Once the white was dry I added the Dr. PH Martin's black ink line work again with a brush and finally put in some highlights with some Dr. PH Martin's Bleed Proof White