Flagstone is expensive, but looks great when finished. Landscape design depends on your home, taste, and space. I have seen great gardens offset with squares or rectangles, amoeba's usually look good within a large area because of the flowing lines, but if you are confined, square isn't bad expecially if you bring in weeping type woody plants and put plants in containers spread about. I would spend my money on plant material and use the concrete slabs that you have.

Here is a link that might be useful: Propagating Perennials

Thanks a million for the feedback. I did not realize that I'd had to check the site for follow-ups. I thought I'd receive them in email.

Makes sense... what you recommend.