Another way to achieve a similar effect (for PSCS) is to first type out the text you want to fill then rasterize that text layer. Next, open and select the paper/background you want to use click 'edit..copy'. Next, highlight and select the text layer (blinking dotted lines)and then click 'file..paste into'.

This will create a masked layer over the original text layer. Right click and apply the layer mask on the masked layer and that's it. You're left with the text filled with your background and the original text layer, which you don't need any longer. This works with anything, text, shapes, whatever. If you want to fit the paper better into your text or shape, you can resize the masked layer before you click apply.

__________________