Are you an iPhone owner who enjoys image manipulation, is interested in fun apps, and has some time to kill? Then you may want to download ColorSplash. I recently downloaded the application and started to play around with it at a recent conference – which is what I do when the speaker is incredibly boring...

It’s an amazingly simple app that converts photos to grayscale and then allows you to go back in and add color to selected areas. Once you get the hang of using one finger to paint and two fingers to position the image, it's really quite fun and yields pretty satisfying results for something that only costs a buck 99.