1. Drawing an icon
Start "Sketcher" and create a new sketch.
Draw a picture in black on a white background. Set the color to black. Please use a somewhat thicker pen. The icon may look thin and collapse because they reduce the size if you use a thin pen. For iPhone 4 or later, use a 50 pixel wide pen. For iPhone 3 or older, a 25 pixel wide pen is good.
Draw a picture. When you draw detail, pinch to zoom up.
When you finish drawing, tap the action button and select "Save to CameraRoll".
2. Taskbook: Adding the new tag
Select the Settings button on the toolbar and then tap “Tags.” In the Edit Tag screen, change the name and tap the Icon Image. Choose the “Select From Library” button.
Select the picture you saved earlier in the camera. Place the picture so it fills as much of the frame as possible.
Change to the color of your choice to complete the configuration.