I like this kind of stuff too. Nice start to taking pictures...
I noticed your thread in the Beginners forum...good for you for starting back at the basics. There is no shame in that!
I'll take the last picture you just posted for instance...I like the symmetry of it. Now imagine if you'd gotten down on the ground and shot looking up from the middle of that metal piece on the ground? Not saying that would have made a better picture...but my point is, to try different angles with everything....you could be REALLY surprised as to what you come up with! I am no better than you at this kind of photography but I thought I'd throw it out there, to try all sorts of different angles...and play with the depth of field too. Learn how to use your manual settings...those will save you a lot of bad shots.