Group now extends PIXI.DisplayObjectContainer, rather than owning a _container property, which makes life a whole lot easier re: nesting.

examples/wip/misc/rendertexture1.js

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+
+var config = {
+
+	width: "100%",
+	height: "100%",
+	renderer: Phaser.WEBGL,
+	parent: 'phaser-example',
+	state: { preload: preload, create: create, update: update },
+	backgroundColor: '#ff0000'
+
+};
+
+var game = new Phaser.Game(config);
+
+function preload() {
+
+    game.load.image('spin1', 'assets/sprites/spinObj_01.png');
+    game.load.image('spin2', 'assets/sprites/spinObj_02.png');
+    game.load.image('spin3', 'assets/sprites/spinObj_03.png');
+    game.load.image('spin4', 'assets/sprites/spinObj_04.png');
+    game.load.image('spin5', 'assets/sprites/spinObj_05.png');
+    game.load.image('spin6', 'assets/sprites/spinObj_06.png');
+    game.load.image('spin7', 'assets/sprites/spinObj_07.png');
+    game.load.image('spin8', 'assets/sprites/spinObj_08.png');
+
+}
+
+var renderTexture;
+var renderTexture2;
+var currentTexture;
+var outputSprite;
+var stuffContainer;
+var count = 0;
+
+function create() {
+
+	// create two render textures.. these dynamic textures will be used to draw the scene into itself
+	renderTexture = game.add.renderTexture('texture1', game.width, game.height);
+	renderTexture2 = game.add.renderTexture('textur2e', game.width, game.height);
+	currentTexture = renderTexture;
+
+	// create a new sprite that uses the render texture we created above
+	outputSprite = game.add.sprite(game.width/2, game.height/2, currentTexture);
+
+	// align the sprite
+	outputSprite.anchor.x = 0.5;
+	outputSprite.anchor.y = 0.5;
+
+	stuffContainer = game.add.group();
+	stuffContainer.x = game.width/2;
+	stuffContainer.y = game.height/2;
+
+	// now create some items and randomly position them in the stuff container
+	for (var i = 0; i < 20; i++)
+	{
+		var item = stuffContainer.create(Math.random() * 400 - 200, Math.random() * 400 - 200, game.rnd.pick(game.cache.getImageKeys()));
+		item.anchor.setTo(0.5, 0.5);
+	}
+
+	// used for spinning!
+	count = 0;
+
+}
+
+function update() {
+
+	stuffContainer.addAll('rotation', 0.1);
+
+	count += 0.01;
+
+	// swap the buffers..
+	var temp = renderTexture;
+	renderTexture = renderTexture2;
+	renderTexture2 = temp;
+
+	// set the new texture
+	outputSprite.setTexture(renderTexture);
+
+	// twist this up!
+	stuffContainer.rotation -= 0.01
+	outputSprite.scale.x = outputSprite.scale.y  = 1 + Math.sin(count) * 0.2;
+
+	// render the stage to the texture
+	// the true clears the texture before content is rendered
+	renderTexture2.renderXY(game.stage.display, 0, 0, true);
+
+}