[jbpm-users] Is there any complete sample application based on jBPM version 4?

Hi all, I'm new to jBPM and I'm in a process of finding a workflow framework that can be embeded into our application and come with a graphic designer. I find that jBPM 4 is very interesting and I'd like to learn more about it. I have already read through the user guide and developer guide, I also tried samples come with jBPM distribution, but these examples are quite simple. Is there a more complex sample application that I can look into? Thanks in advance. Best wishes, Mai Sun