In this tutorial, we’ll explain how to create a bar of soap and give it a retro look. This isn’t just any soap though, but vector soap that has a stylistic nod to Fight Club.
Open up a new document and draw a rectangle with the Rectangle Tool (M). Fill it with a pink color or any other color of your choice. Then apply rounded corners in Effect > Stylize > Rounded Corners. Choose a fairly high setting of around 18 pt. Read full tutorial here