Advertising companies are easily found for every advertising need and those companies located near tourist centers often have staff that speak English. If you're willing to take the time to do the searching you can locate a company with the creativity you are looking for.
Some related services that might be of importance to you are Graphics & Photography, or possibly even Software Development.
Digital Monopoly Asia
A full service Digital Agency located in Bangkok, Thailand. We are considered to be one of Thailand’s largest agencies offering a wide range of services from Custom Web Design...