These indicators are the animated GIF’s busy.gif and processing.gif that can be found in your installation folder. In a typical installation this folder is D:\Program Files (x86)\Compuware\Uniface 9.5.01\uniface\webapps\uniface\common\images\ubusyindicator.
You can replace the standard gif’s with other ones. Just put them in the folder and give them the correct name.
Changing the location where the indicator appears is also possible. It is controlled by the css file D:\Program Files (x86)\Compuware\Uniface 9.5.01\uniface\webapps\uniface\common\css\ubusyindicator\ubusyindicator.css.