Who are you to say what the ideal aesthetic is?
I can't decide if I think you're trolling, or serious. Either way you have the right to an opinion.
For those of you who want to look at some facts, Houston is in Zone 9. This means it will hard freeze, likely at least once a year. The aesthetic that AnTonY is describing would be a waste of money, and take our natural environment in a direction that is unnatural. Houston is very much 'gulf coastal plains' meet 'pine forest'. If you want an example of our natural environment, check out what Memorial Park is doing to restore their forests.
As for landscape choices... I would recommend we stay close to our natural roots, and avoid plants that freeze easily (tropical). Sub-tropical looks can be achieved in moderation with smart plant selections. If you do decide to go down the tropical route, find the hardier varieties and mix them in with some Texas natives.
And yes, I am in the business.