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function getRandomColor() {
	var letters = '0123456789ABCDEF';
	var color = '#';
	for (var i = 0; i < 6; i++) {
		color += letters[Math.floor(Math.random() * 16)];
	}
	return color;
}

// source:
// https://stackoverflow.com/a/1484514


function getRandColor(brightness){
    // Six levels of brightness from 0 to 5, 0 being the darkest
    var rgb = [Math.random() * 256, Math.random() * 256, Math.random() * 256];
    var mix = [brightness*51, brightness*51, brightness*51]; //51 => 255/5
    var mixedrgb = [rgb[0] + mix[0], rgb[1] + mix[1], rgb[2] + mix[2]].map(function(x){ return Math.round(x/2.0)})
    return "rgb(" + mixedrgb.join(",") + ")";
}
// source:
// https://stackoverflow.com/a/7352887