With the "negatives" left over, I decided there must be a second component to the gift. Those things are too time-consuming to cut out and not use for something. So I applied those to a scrap of black fabric and painted around them, so that when those peeled off they coordinate with the maternity shirt. I sewed that onto a burp cloth.
To wrap it up, a bird embroidered onto paper with a little button eye. Now to wait and find out whether this is a boy birdie or a girl birdie. Your guess is as good as mine.