This step by step tutorial shows you how to fill text with an image in Photoshop, as shown below. If you are a blogger this is a really nice way of creating a header.
Step 1: Open a new file in Photoshop and type your font.
Step 2: Open the image that you want to fill the text with.
Step 3: With the image in view, Select all and Copy. If using Windows you can use the shortcut Ctrl and A to select all and the Ctrl and C to copy. If using a Mac, Command and A to select all and Command and C to copy. Now click on to your text image from Step 1 and paste, Ctrl and V (or Command and V if using a Mac). This plonks the patterned image on top of the text, like so.
Step 4: From the top Menu select Layer and then select Create Clipping Mask from the drop down, like so...
Boom! Job done!