For a detailed discussion of icons, refer to the BLAF Icon Specifications on the Oracle Technology Network (OTN).
If you need to develop new icons to support your customizations, refer to Icons in BLAF Applications and the BLAF Icon Naming Strategy on OTN.
You may also want to look at the Icon Repository for BLAF on OTN to find the base templates that were used to create icons.
Icons are stored as gif image files in the OA_MEDIA directory. You can change the image of an icon in one of two ways:
You can replace the appropriate image file with a file of the same name that contains an updated icon. This updates all instances of that icon globally.
You can create an administrative-level personalization for the page by setting the Image URI property on the image page element to a different image file. This updates the image for that specific usage of the icon.