I call this “Three’s a crowd.”
The colors are emblazoned across the wall and what is so amazing is what seems to me are gold leaf incorporated into the paintings.
Wat Phra Kaew is accessible via the Chao Phraya Express Boat.
The quickest way to get here is to take the BTS Silom Line to SAPHAN TAKSIN. Go down the station and walk to the pier Tha Sathorn (CEN). Hop on the Tourist Boat, pay the conductress some 30 bhat (+/-), enjoy the view that the Chao Phraya gives you. Just make sure to go down at pier Tha Chang and you’re there.