I see that you've found some ways to express your anger, so maybe my post is a bit redundant, but I figured I'd share anyway.

Sometimes, there is no way to turn the anger in to a positive. You're feeling anger, it's for a reason, and sometimes, it just needs to be expressed. I'm really not comfortable with accepting or expressing anger - it's been a forbidden emotion for me most of my life, so this is just something I'm slowly learning. Sometimes, we can't accept an emotion or work through it or rationally/logically deal with it until we've just expressed it in it's raw form.

One of the things I like to do is to take a cup of ice outside and hurl ice cubes at the side of my house (brick walls). At first, it's usually just raw anger, but after a bit, I can usually name each bit of anger that the ice cube represents as I throw it. And, as the physical expression of my anger lessens, I usually let the dogs outside (don't want to accidentally hit them with the ice cubes when I'm throwing them) and the dogs will gobble up all the ice pieces and I can laugh and imagine them eating up my anger for me or eating up the cause of my anger.