Five years ago I illustrated a full deck of Japanese Hanafuda playing cards. Here are all 50 of the cards, sorted by suit. There's way more information on my old blog; just start here. Or you can play Koi-Koi online!
Plum
Eulalia (Pampas Grass)
Clover
Iris
Pine
Peony
Wisteria
Paulownia
Willow
Maple
Cherry
Chrysanthemum
Blank, Tengu, Napoleon (card back)