Planted Tank Enthusiast
Join Date: Apr 2012
Location: Edmonton, Canada
I think you should look at this like urban planners do when trying to integrate tall buildings into the landscape. That small tower needs to be fixed so it isn't leaning, it should match the other tower, that should help with perspective.
The tall tower, plant tall bushy things around it to soften the edges and something in front that will grow to about halfway up. Do almost the same thing with the other tower. Put a low growing carpet something in front of it.
For something cool, you could grow moss on top of the towers so that it hangs down. Otherwise I would probably leave them bare.