Natural Surroundings

I took these images whilst walking around Solihull College, I was intrigued by the textures and as I enjoy producing close up photography decided to try and capture the natural surroundings. I used a 70-300mm Sigma lens, although it has a macro switch  i couldn't get to grips with this setting. I think these images would look highly effective in black and white. I am therefore going to re-shoot some similar images on film using a macro lens.