Most of the application in ESS have used the FPM (http://help.sap.com/saphelp_erp2005/helpdata/en/3f/20888224c544a2a01d9fe618902ae5/frameset.htm) to develop new self service applications.
You may start developing applications as described in the help link and then integrate it with ESS. You will have to maintain some setting under Homepage Framework in SPRO. There are plenty of threads describing this. Do search
Thanks,
GLM
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