input - novas cores de pincel [meu código]

<canvas width="600" height="400"></canvas>

<p>Escolha uma cor: <input id="color" type="color"></p>

<script>
    var canvas = document.querySelector('canvas');
    var color = document.querySelector('input');

    var pincel = canvas.getContext('2d');

    var paint = false;

    pincel.fillStyle = 'grey';
    pincel.fillRect(0, 0, 600, 400);

    function paintOn(evento) {

        var x = evento.pageX - canvas.offsetLeft;
        var y = evento.pageY - canvas.offsetTop;

        if (paint) {
            pincel.fillStyle = color.value;
            pincel.beginPath();
            pincel.arc(x, y, 15, 0, 2 * 3.14);
            pincel.fill();

        }
    }

    function onOff() {
        paint = !paint;
    }

    canvas.onmousemove = paintOn;
    canvas.onmousedown = onOff;
    canvas.onmouseup = onOff;
</script>