Be careful not to over theme, otherwise it can look quite cheap and date very quickly. Think of the thai look as more about textures , materials and colours. A good referance is looking at some of the luxury thai hotels.
trisara phuket
amanpuri phuket
banyan tree phuket
colours : drk browns , orange, coffee , mink , beige.
woods : teak , wenge, cherry
carvings , naturals, carved clay , beige linen, orchid flowers .
You might want to do a mix of wall colours and then add a thai feel by hanging silk table runners on the wall or a large carved wooden panel. Shops good for this are John lewis, the Pier and various independant boutiques and if near London Camden mrkt has some great small shops with thai things. You can mix quite modern sleek furniture with highly carved rustic furniture to acheive this look , the mix helps keep it up to date and less themed.