These two sets of free Photoshop actions play tricks with borders and shadows to give your images an impressive, pseudo-3D look:

a. THE BORDER AND BEND ACTIONS:
This set contains 7 free Photoshop actions that produce seven variations of the effect. The final photo is presented as being curved vertically or horizontally. The border and the casted shadow add to the overall impression. The actions let you tweak the border color. The set contains a number of subroutine actions at the end, which you should not run.

b. THE DISCRETE ACTIONS:
An alternative, very elegant approach to the particular technique. The 'Discrete' set contains 4 free Photoshop actions. The image corners are curved slightly in this set.