It is the simplicity of the first photo that intrigues me. All horizontal lines, enough for us to recognise it as a school bus on grass, and then the circle of the tyre. No more. Just lines, colours and that circle. Cool!
Great perspectives, and -- as LaFoto pointed out -- the simplicity of the first one really makes it stand out (in a good way!)
nice shots, i really like #1 too for the reasons already mentioned, i like #3 too, i love the green fields you are capturing... everything is brown and dead around here...