Use Photoshop's Drop Shadow effect to make art jump off the screen!
Instructions

* STEP 1: Open Photoshop and create a new image file measuring 300 by 300
* STEP 2: pixels.
* STEP 3: Set the resolution to 72 pixels per inch and the mode to RGB color.
* STEP 4: From the Layer menu, choose New and Layer. Click OK.
* STEP 5: Select the Paintbrush tool and choose a light foreground color. Paint a shape on the canvas.
* STEP 6: From the Layer menu, choose Effects and Drop Shadow. Click OK.

Tips&Warnings

* This effect can be applied to any object on its own layer.
* You can change the Drop Shadow's attributes in the effects pop-up window.