I began by creating two 8"x12" pieces in mostly pinks, with a little light green in there, and (I can't paint without it) quinacradone gold.
Then I cut each one into four pieces, each 4"x6". These are to be postcards (takes the pressure off of making "Art"). After that I did something to each one to make it unique. I did not want these to look like I had just cut up a larger piece and called it good. I added a heart theme to each of them, this being the valentine season. This was a stretch for me too, as I rarely use heart icons in my work.
Click here for a video tutorial on this way of making postcards.