This is my first creation. I built it quickly (in about 1 hour). The tower stands just under 8' tall.
Despite the fact that the photo makes it look like the tower was leaning, it was actually quite stable and straight. I think using this technique you could build a tower up to double this height, but that is a project for another day.
About this creation
The base and, in fact most of the tower, is staggered directions of 1x blocks forming a hollow tower that looks airy, not solid.