Both the iPhone and iPad versions of this app are temporarily free. Normally the iPhone version retails for $0.99/£0.69 and the iPad version retails for $1.99/£1.49.
Filter Splash let you apply dramatic effects on your photos. Simply use your finger as brush to remove or bring back the filter image from regions of your photo.
To download the free iPhone version/Click here
To download the free iPad/HD version/Click here