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Here is a few FREE Mockups and Tutorilas you may wish to play with for something different. I can easily add more if needed, including your suggestion.
Easy way to straighten selections like a building or horizon.
Original image is by John Wheat from Cranbourne West, Victoria.
Mockups for 3 different Film Strip effects using "Smart Objects"
Polaroid Photograph MOCKUP using "Smart Objects"
An easy way to add Drama to a cloudy Sky using layers.
Photo Frames MOCKUP using "Smart Objects"
Open Book MOCKUP using "Smart Objects"
Business Card MOCKUP using "Smart Objects"
Out of Frame TUTORIAL
Flash Exposure Calculator by Bob Young.
PDF guide with lots of hints and tips for Photoshop users.
PDF guide for Photoshop beginners and pros alike.
O'Reilly's Photoshop  "Missing Manual"