That's too funny because I typically refer to myself as a "chaos gardener" - meaning I just let it all jumble together too. I think in the front yard's case, it's a matter of having a LOT of plants and having simply selected for height (tall at the back, low at the front) and some degree of color continuity (very loosely defined).

I'm so impressed by your veggies, by the way. I am NOT a productive veggie gardener as of yet. Still trying, still underwatering probably, and still haven't amended the soil quite enough. I'm a better winter gardener here since the weather isn't out to kill everything if I so much as get distracted and forget to step out into the garden.

Pics coming up!