The Grand Palace

I'm staying in Khaosan Road one more night, but then I plan to move to the Siam Square area - it should be quieter, cooler (in the literal sense - I'm going to get a room with aircon), and less ... ghetto.

demon decorated in multi-coloured tiles

This guy (along with several friends) is supporting one of the many Chedi on the grounds. (Chedi: from the Palli cetiya - stupa; monument erected to house a Buddha relic. It's possible this isn't technically a chedi, but hey, it looks like one to me.) He's covered in mosaic tile, as are many parts of the buildings on the palace grounds.