Crocheting is simple in only requiring a single tool - a small needle with a hook on one end. Crocheted items are a good way of using up small lengths of wool in a form of patchwork as per this picture. They can also be produced in more formal, repetitive colour patterns, and in different materials such as cotton. One draw-back however are the limited styles achievable.
<a href="//commons.wikimedia.org/wiki/User:Sudzie" title="User:Sudzie">Sudzie</a>
<span class="int-own-work" lang="en">Own work</span>