Immense variegated pinnate leaves and dense pine-cone-sized clusters of lavender flowers: At first glance, this could be the ultimate plant. In reality, this is a duet of 'Amethyst Falls' wisteria—demure and much later-flowering than the Asian forms—and just a portion of one of the gigantic palm-like leaves of the 'Aureovariegata' form of tree angelica.
If the display were all from one plant, it would be the category killer, the ne plus ultra. All that would be needed would be to find such a creature, afford to buy it, and then plant it and nurture it. But the effect requires two plants, each reasonably available and easy to grow. Nonetheless, it's more of an achievement.