Meadow planting has become popular in recent years. Meadow-like is perhaps a better way of describing it because on the whole actual meadows are survivals of pre-industrial agriculture, for example the traditional hay meadow. The new 'meadow' above is in the grounds of Benslow Music School.
Various seed mixtures are available for sowing on a large scale. The species in each mix are selected according to their suitability for particular conditions e.g. chalky soil, clay, moist/dry etc. What tends to happen in practice is that several of the species will dominate. The soil and aspect in a certain locale may be particularly favourable for them and often they will be the more generalist wildflowers.
Case in point the meadow at Benslow is currently a mass of Ox-eye Daisy (Leucanthemum vulgare). Sometimes called Moon Daisy they are prolific and not just in meadows- often seen in drifts along roadside verges, by railway tracks, on field margins etc. They spread vigorously by self-seeding and creeping rhizomes; one of our common wildflowers that is still common. Whether by accident or design the sight of Moon Daisies en masse is spectacular.