Hi all,
there is something which launched two years ago. It's called "Marian vow" and connects four Marian shrines, start in Slavonija (Aljmaš) then goes to Marija Bistrica, Rijeka (Trsat), Sinj then goes to Medjugorje in Bosnia and Herzegovina and ends in Dubrovnik. Also passes historic and national sites and natural beauty.
http://www.marijanskizavjet.hr/
Unfortunately, there is no translation into English yet, but you can see the route.
Currently, this is not a classic pilgrimage routes, has determined a date to start and date to end, accommodation is mostly spartan and pilgrims can be connected where and when they want. Accommodation provided organizer in places that are determined before departure. I walked the last years one day, after I returned from Camino.
If you need any additional information, just ask
Bota