Ive seen this a lot in Laos and Thailand, where the depiction of Buddha varies depending on the day.
Ive taken an explanation from this website.
Traditionally it is believed that Buddha spent 7 days following his enlightenment thinking of the suffering of all living creatures and how unimportant his life was prior to reaching enlightenment.
When visiting a Thai Temple you may be interested to look at the many Buddha images and their different poses, which depict significant moments in the Buddha’s life, whilst most Buddha images feature the Buddha in meditation, there are more than 100 different poses, There are also some postures that each represent the 7 days of the week, and Thai people pay particular attention to the Buddha image which corresponds to the day they were born and assigned a different color each day.
Buddha name: Phra Tawai Natra (Restraint)
Representing an Open-Eye posture, the Buddha stands with hands crossed over his abdomen, in pensive thought. The right hand is placed over the left on the upper thigh. Here, the enlightened Buddha contemplates his achievements and knowledge, standing still for 7 days under the Bodhi Tree to contemplate the suffering of all living things.
A person born on a Sunday is respectable, wise, loved by friends and family. He is likely to be in a professional occupation. His lucky day is Wednesday and lucky color is green while the unlucky day is Friday and unlucky color is blue.
Buddha name: Phra Ham Yath (Making peace)
This is a standing Buddha pose, with the left hand hanging down by the side. The right hand is raised at the chest, palm
facing outwards, in a singe-handed gesture. This posture represents “Preventing Calamities”, which is also known as
“Pacifying the Relatives.”
A person born on a Monday is serious with a good memory and a love of travel. This person is likely to be in a skilled occupation whose lucky day is Saturday and lucky color is black. His unlucky day is Sunday and unlucky color is orange.
Buddha name: Phra Sai Yas (Reclining)
A reclining Buddha posture. The Buddha lies on his right side with his left arm draped along the body and the right arm acting as a pillow, propping up the head. One of the most dramatic and breathtaking reclining Buddha images can be found at Wat Pho
This person is serious, brave and active most probably in the services. His lucky day is Thursday and lucky color is yellow. The unlucky day is Monday and the unlucky color is white.
Buddha name: Phra Um Bhat
There are two images that represent Wednesday, divided into day and night according to Thai astrology.
The Morning is for Receiving.
The Buddha is standing with heels pressed together, holding an alms bowl at waist height, with both hands wrapped around it,
This image shows Buddha holding an alms bowl. The Buddha visited his family after four years in the monastery. His father was not content when he saw the Buddha “begged” for food holding an alms bowl. Buddha explained to his father that performing pindabat, or holding an alms bow are the lineage of Buddha. Thus, the disciples can devote their food.
The person born on Wednesday morning is polite, artistic and emotional. He is most likely working creatively. Wednesday night is their lucky time and the lucky color is green. His unlucky day is Tuesday and the unlucky color is pink.
The Evening is for the Blessed One
The Buddha seated to receive gifts from a monkey and an elephant. As Buddhism teaches respect for everything living this posture shows the respect of all living things for the Buddha.
This person is hard working and honest. He is likely to be employed in a profession with the lucky day of Monday and the
color white. The unlucky day is Thursday and the unlucky color is yellow.
Buddha name: Phra Samathi (Meditation)
This sitting Buddha image is one of restful meditation, with legs crossed (right leg on top of the left) and both hands resting on the top, with the right hand over the left, both palms upwards. This is the perfect mental discipline. The gesture is the ultimate balance of tranquility and thoughts. It is believed that the body in the position is receptive to power or energy to enter the body from the top of the head and the opening palms.
This person is peaceful, calm and honest –likely to be a teacher or in the legal profession. His lucky day is Sunday and the lucky color is orange. The unlucky day is Saturday and the unlucky color is black
Buddha name: Phra Ram Pueng (Contemplation)
The posture depicts the Buddha standing at the Banyan Tree, both hands are crossed at the chest (right over left), palms facing inwards, wondering how he can explain the cause of suffering to his followers.
This person is fun loving, friendly and ambitious, probably an entertainer or public figure. Their lucky day is Tuesday and the lucky color is pink. The unlucky time is Wednesday night and the unlucky color is light green.
Buddha name: Phra Naga Prok (Protection)
This dramatic statute depicts the Buddha sitting in meditation, protected by a cobra hood. The Buddha sits cross-legged in meditation, with overlapping hands, palms upwards, whilst Mucalinda, the cobra (King of Naga) spread its hood to protect
the Buddha from a rainstorm while he was in profound meditation.
This person is calm, logical and a bit of a recluse. He is very likely engaged in manual work of a skilled nature. The lucky day is Friday and the lucky color is blue. The unlucky day is Wednesday during the daytime with the unlucky color of green.