<svg xmlns="http://www.w3.org/2000/svg" width="500" height="500">

<filter id="f1" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse">
  <feFlood flood-color="#00ff00" x="0%" y="0%" width="20%" height="20%" result="flood1"/>
  <feFlood flood-color="#0000ff" x="20%" y="20%" width="20%" height="20%" result="flood2"/>
  <feComposite in="flood1" in2="flood2" x="0%" y="0%" width="40%" height="40%" result="pair"/>
  <feTile in="pair"/>
</filter>
<g filter="url(#f1)">
</g>

</svg>