To differentiate dev/test from prod, we can change the form color by changing some profile options.
Profile option change to be done:
1. Set the Java Look and Feel profile option value to oracle. If you set it to generic, it will take the default values and you wont be able to set your own color.
2. Then set Java Color Scheme profile option value to any of the LOVs as per your choice.
Remember to set this at site level
NOTE: It won't get effect immediately, you have to log out from
application and again you have to relogin to view color change effect