I like the last one more than the others. Im not exactly crazy about any but the last one is the least offensive(cant stand blue background on fw tanks lol)
Then def try out the tiles man, its a nice look only problem might be the poop getting underneath the tiles..if you can handle having to clean underneath them then go for it.
Also you could try painting the bottom pane of glass black, i dd that on a previous bare bottom setup and enjoyed the look