Google has added a scribble feature to its Gmail app for iOS.
Now you can quickly convey that eureka moment to a colleague, or simply brighten a loved one's day with a personal scribble in Gmail for the mobile web browser and the Gmail app for iOS. In the compose view, click on the scribble button to open up the drawing window. A lightweight interface makes it easy to get your idea down.
You can try it out by downloading the Gmail app from the App Store at the link below...