cardboard box and paper tube art

I work in a photo lab where we throw loads of cardboard boxes and paper tubes away daily. (paper tubes are the white tubes left after the photo paper has run out) I had this idea earlier this year to bring them home with me and try and make art with them. a friend of mine calls it my "waste not art". I just call it "fun with paints" haha!... these are a few things I've done with what we would have ordinarily thrown out at work.