What is it more precisely that you need to do?
All you need to have for a prism module is a class that implements
IModule and load it. There is no problem if the project is a wokflow project or a plain class library.
I did a really small spike module that provides a service implemented in WF to other modules, and found no issues. What I did was:
Created a WF project
Added a code activity to the default workflow (just to see it works)
Added a class that implements
IModule and registers a service IWorkflowService in its Initialize method
Created a class that implements
IWorkflowService that in its constructor creates a WorkflowRuntime and has method to instantiate the default Workflow.
Use the service from another module.
Of course you will need to solve several Workflow related stuff such as:
how to instantiate Workflows from other modules in a decoupled way
etc, etc, etc.
I have no knowledge of any publicly available project, Quickstart, Reference Implementation or guidance on integrating Prism and WF. There is one related discussion you might find interesting:
Using WF activities with Dependency Injection in a CAL application
If you had in mind a different scenario that you are not able to solve, please let us know so we can provide a more specific answer. Let me know if this helps!