A handwritten note is always in bloom. Hellos from faraway spots in the summer. Back to School correspondence in the fall. Thank yous following winter fetes. And overdue updates between friends in the spring, all on stationery with garden-inspired good looks.
Your Thank You Notes should reflect your aesthetic, whether it's classic, romantic, minimalist or modern. The recipient of said note should know who it's from even before he/she reads a word.