Typology of Frick Fire Hydrants

My tentative idea for my typology is to create a typology of fire hydrants from Frick Park. The park is a place that is close to my heart and I have been passively taking pictures of every fire hydrant that I inexplicably find in the park. I want to go back in a more consistent manner and search out as many of the fire hydrants as I can. I think this has the making of a good typology project as every single one of the fire hydrants is unique due to the high levels of wear and tear associated with being in the  middle of a forest. My main question is how should I best capture these fire hydrants. I could just take pictures from a consistent angle, but I want to do something a bit more unusual if I can. I could include the path that I take to find these fire hydrants as a part of the capture, or I could use something like putty to create pressings of a specific part of each of these fire hydrants. I could also take a paint chip off of each of them but I am not sure what I think about a capture technique that requires destruction.

My current fire hydrant collection:

https://photos.app.goo.gl/7mu7mpvHZfvdmg7f8