Warm and cool colors are something that I think about all the time in my painting and enjoy playing warm colors against cool colors to create vibrate and dynamic watercolors.  Here is a fun exercise that you could do with warm colors or cool colors – your choice!  I did mine with warm colors.  You will need your watercolor paints, watercolor brushes and a Gold Leaf Pen for this exercise.
Start by drawing big shapes in your journal with the gold leaf pen.  I drew my initials JN.  Make sure you go off the page here and there.

 Then add smaller shapes within your large initials.

 Pick a color scheme warm or cool.  I chose a warm palette so I painted all my shapes with yellows, oranges, reds and combinations of these colors. The gold leaf pen lines will act as a resist to the paint.

This is my final page in my watercolor journal