LOVE the idea of planting low-growing, flowering ground cover between flagstone pavers, I'd use the one in the picture Mazus reptans, or purple thyme or something like Sweet Vernal grass (vanilla scented)
I would love to walk under this gorgeous canopy and allow the dense foliage provide cool shade during the warmer months, then as the weather cools and the leaves fall, the winter sun is allowed to penetrate. The flowers are highly scented.
Love these pink alstromeria. We have some growing in our garden and I use this image as the logo for my GardenImagery business. The flower is Alstroemeriaceae (~Liliaceae) and it is a perennial, originally from Peru in South America. It loves the Australian climate.