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check blueXml : http://www.bluexml.com/v3/case-studies/ .These case studies shows how to build a customized page for workflow tasks.
<config evaluator="node-type" condition="wf:adhocTask" replace="true"> <property-sheet> … </property-sheet> <dialogs> <dialog name="manageTask" page="/custom/jsp/workflow/special-manage-task-dialog.jsp" managed-bean="ManageTaskDialog" icon="/images/icons/manage_workflow_task_large.gif" description-id="manage_task_desc" /> </dialogs> </config>