You can now use the hitArea property on Sprites and Image objects. hitArea can be a geometry object (Rectangle, Circle, Polygon, Ellipse) and is used in pointerOver checks.

examples/wip/grid.js

@@ -0,0 +1,54 @@
+
+var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create, update: update, render: render });
+
+function preload() {
+
+    game.load.image('block', 'assets/sprites/block.png');
+
+}
+
+var grid = [];
+var currentTile = new Phaser.Point();
+
+function create() {
+
+	//	The block.png is 95x95, so for this we'll create a little grid or it won't fit:
+
+	for (var y = 0; y < 5; y++)
+	{
+		grid[y] = [];
+
+		for (var x = 0; x < 5; x++)
+		{
+			grid[y][x] = game.add.sprite(x * 95, y * 95, 'block');
+		}
+	}
+
+	game.input.onDown.add(clickedBlock, this);
+
+}
+
+function clickedBlock() {
+
+	//	Bounds check
+	if (currentTile.x >= 0 && currentTile.x <= 4 && currentTile.y >= 0 && currentTile.y <= 4)
+	{
+		block = grid[currentTile.y][currentTile.x];
+		block.alpha = 0.5;
+	}
+
+}
+
+function update() {
+
+	//	95 = width and height of the block.png
+    currentTile.x = this.game.math.snapToFloor(game.input.x, 95) / 95;
+    currentTile.y = this.game.math.snapToFloor(game.input.y, 95) / 95;
+
+}
+
+function render() {
+
+	game.debug.renderText('Tile X: ' + currentTile.x + ' Y: ' + currentTile.y, 32, 32);
+	
+}