Tian Pai 天牌,

天牌，天禄，江西
Tian Pai (= Heaven Cards), Tianlu, Jiangxi ...

This is a curious set of domino cards purchased in China. It is structured like an ordinary deck of domino cards, with the exception that there are 6 copies of each card; 3 decorated, 3 plain. The decorated cards have an image of a flower or plant of some type

The decorated cards have an illustration on them; the plain cards are devoid of any markings except the dots. Notice the pleasingly symmetric swan on the [3/1]

 For the reasons of space, for this image I have omitted the unmarked cards. 

 However, I should stress that ALL the cards come in the marked/unmarked form, like you saw in the first image

Unlike most decks of domino cards (eg _ and _) in this deck, what would be black pips in the ordinary deck are printed green. 

The cards on the far right are the Jokers,; inscribed with the words 百搭 “Hundred Combinations". The trident-like shape in the middle of the left-hand card is actually an archaic variant of the character for 'longevity' 寿， Shou.