Technology - That's a really interesting and creative image and on point for a photography challenge.
Discarded - Despite it's size there is a good chance I would have tripped over it! Nice atmospheric capture.
Flora - Nice composition with for me just the right amount of foreground and background interest. The cotton grass/rushes have a look of HDR about them
Unusual - It's definitely out of place and spot on for the theme. I wonder what the story is on how it came to be there?
Snappers Choice - All the elements of the image work together well. I might have been tempted to crop the right to remove the separate tree in the top right.