You can draw your shapes by hand or use free coloring page sites online. Once you have what you want and size on paper then trace your applique on wonder under lite.
More instructions are in this post. If your animal/shape you want turned a certain way, remember that when you trace it on wonder under it will be reversed. So you need to reverse your drawing/print. Simply trace the back of your paper with a heavy marker and use that for tracing on the iron-on paper.
Use fun prints, layer fabrics and add buttons and/or embroidery for fun details.
Or just order/buy one from my shop. Bunny and tulip shirts coming up.
...And baby hooded towels, toddler skirts sets, big girl tees...... :)