The iPhone's built-in camera might not be the best out there, but it's perfectly capable for casual snapshots. If, however, you want to spice up those shots a bit, you can turn to Sketches from and let your fingers do the image-editing. With the $5 Sketches (now on sale for $2 during the holidays), you can use your finger to draw on your pictures in a variety of colors, as well as inserting clip art like mustaches, clothing, and holiday paraphernalia. And when the pictures get too involved, a quick shake will remove all of your additions, leaving the photo as pristine as before.--DAN MOREN

Read our review of Sketches; get more info on Sketches at the App Store.

Best photo filter tool

The iPhone's built-in camera makes for a convenient way to snap quick pictures, but CameraBag makes those pics a lot more interesting. A collection of nine photo filters from that you can apply to images in your iPhone's photo library or to those you take from within the app, the $3 CameraBag includes such filters as Helga (square-format with vignette), 1974 (faded and tinted), Fisheye (warped lensing), and Cinema (wide-screen and dramatic). You can even combine filters by applying one to an image, saving it, and then applying another one to the same photo.--JONATHAN SEFF

Read our review of CameraBag; get more info on CameraBag at the App Store.