I've been practicing my crochet skills a lot lately. The summer is when I need to have very portable projects to move around a lot with my boys and crochet really fits the bill. This summer I'm focusing on learning the basic design elements to amigurumi, which are crocheted dolls or animals.
One design element that is fairly frequently repeated are circles, balls, and spheres. In my searches I came across this awesome pattern. It is exactly as the name describes, an ideal sphere. Even if you aren't making amigurumi things then this makes the perfect toy ball, which is what I made to practice with! My boys love it and it was made with left over yarn so it was practically free to make. Love it! :)