Onyx Hospitality Group. Use our Mosaic Collection Newsletter Promo Code with your next booking and get special promotions at our hotels in Thailand from now to 31 August 2015 , rates from 800 THB. Booking period now to 31 July 2015. Period of stay 1 June 2015 to 31 August 2015. Use promo code: TmcJU5AF.