transparency: Using your first, lighter color cover the area with shapes. Let dry completely, then choose a slightly darker or more saturated color and paint more shapes, overlapping first layer. You can repeat this process as many times as you like.
Splatter: Load your brush with paint then hold it over the top of your paper. With the other hand, tap your brush and watch the paint splatter onto your paper. Rinse your brush, choose your next color and splatter away.