AppiCurl

PageCurl lets you create turning pages. Through different sliders you adjust interactively : angle, level, radius.

The PageCurl color can be fully adjusted through the vignette of your choice.
You can simply drag and drop from IPhoto, Aperture or else. Create/Save your own page Curl effect and collect a JPEG, TIFF, BMP, PNG or even a Photoshop (PSD) file.