Designed for speed and ease of use, Snap Filters lets you apply simple filters to your photos and make the most out of your iPhone's camera.
You can review the preset filters to decide in a second which style will make the most of your photo, then easily and precisely personalize the filter settings to get it just right — choosing from a mosaic of thumbnails for a snap judgment, or manually adjusting sliders for perfect precision.
Settings include: brightness / contrast, colorization / desaturation, black or white vignetting, and cropping to a square frame. Snap Filters remembers your settings from one photo to another, so you can easily apply the same filter to a series of images.
Once you've saved your image to your iPhone's photo library, you will be able to copy it to the clipboard or e-mail it straight from within the app. You can even set up a default e-mail recipient, subject, or body in the Settings application (so you can very easily send your photos to Flickr by setting up your upload e-mail address, and adding the tags "iphone" and "snapfilters" to the message body).
You can find example images here:
Don't hesitate to add your own photos to the group!
A free version — 100%-functional, but adding a watermark to the final images — is available on the App Store: search for "Snap Filters Free" if you want to try the application before you buy.