Make selections, at least one marquee,
one ellipse, one with the lasso. Use the feather and other
options. Paint them with some color with your Paint Brush.
Make different shapes on the same canvas
and use the magic wand tool to select different colors.
Select one single color and remove it from the image.
Using the magnetic lasso tool, select part of the image
and remove the selection.
Choose Various parts of your image and
move them around to different parts of the canvas using
the mover tool.
Multiple selection image.
Adding to existing selection image.
Fill some selections using the Alt-backspace and the Cntrl-Backspace
commands.