There used to be the EUROPIV Synthetic Image Generator (SIG, see also reference below), not sure whether that's still available somewhere. As far as I know, the link provided in the paper no longer works, but you could perhaps try contacting the author.
Hope this helps,
Good luck!
Sita
Lecordier, B. & Westerweel, J. (2004). The EUROPIV Synthetic Image Generator. In: Stanislas M., Westerweel J., Kompenhans J. (eds) Particle Image Velocimetry: Recent Improvements. Springer, Berlin, Heidelberg
It is no problem to provide you with real PIV data if you could be please more specific about what is the paper about and what kind of data do you need? See www.openpiv.net for more info