Wild Blackberries

A few weeks ago, on my walk home after a job, I noticed that behind my house some wild blackberries are growing.  What was better, some of them were nearing ripeness!  I picked them, came home and put them in a container in the freezer.  Now, every time I come home from a job, I have another handful of berries, and soon my freezer container will be full.  I was thinking I should make jam from them.  What do you think?