I wanted to make something in celebration of St. Patrick's day and figured a four leaf clover would be simple enough. But to add some more complexity I wanted to make it in a Celtic knot pattern. A Celtic knot is this weaving pattern that seems to go on forever.
For this I made it in Illustrator and tried splitting up the four leafs a little to be more defined and drew out these slot shapes in a grid pattern and then used the shape builder tool to combine and erase certain areas. This gave me the weaving pattern.