Try a few, or all, of these "very cool" BLUE exercises . . .
For the first 5 color studies, you will need some watercolor paper (this can be a watercolor sketchbook, paper from a watercolor pad, scraps of good watercolor paper, or the backs of your old paintings). You'll also need your watercolor brushes and paints, and a black felt pen . . .
1) FACES --
Start with a wet-in-wet underpainting, using all your blues, and a few analogous colors (like green and magenta). Let this dry completely.
Find some faces from your magazines, and tear them out to use for references. (For this exercise, I recommend not using photos of people you know, because then you'll be too worried about getting a likeness).
Cut up your painted watercolor paper into 4 x 6 pieces, and do a contour drawing of a face, using a black felt pen, on each one . . .
9) SAILBOATS SURROUNDED BY BLUE --
With a soft 6B pencil, or a charcoal pencil, draw a sailboat in the water, near a dock or harbor. With your watercolors, paint some wet blues for the sky and the water, leaving a few white shapes. Add a few spots of bright warm color, and finish your sketch with some darks (pencil or paint). . .
All right! Now it's time for a cup of hot tea (or hot toddy), to warm up . . .