This is a bunch of tips and techniques related to Oracle PL/SQL and Forms.
Purpose
Here is a PJC for textfields that allows to have a blinking behaviour.

This behaviour could be easily applied to other kind of items, like Command buttons for instance.
The Java code
BlinkTextField.java
The implementation class of the Text Item
oracle.forms.fd.BlinkTextField
The methods you can call
Set_Custom_Property( 'BL.BEAN', 1, 'SETBLINKRATE', 'milliseconds' ) ;
Set_Custom_Property( 'BL.BEAN', 1, 'SETFGCOLOR', 'r,g,b' ) ;
Set_Custom_Property( 'BL.BEAN', 1, 'SETBGCOLOR', 'r,g,b' ) ;
Set_Custom_Property( 'BL.BEAN', 1, 'START', '' ) ;
Set_Custom_Property( 'BL.BEAN', 1, 'STOP', '' ) ;
The sample dialog
. Download the blink.zip file
. Unzip the files
. copy the blink.jar file in the /forms/java directory
. Edit your /forms/server/formsweb.cfg file to add the jar file
. Open the BLINK.fmb module (Oracle Forms 9.0.2)
. Compile all and run the module