This example shows how to write in Thai in LaTeX using the thailatex package. It uses UTF-8 encoding so you can type Thai characters directly in the LaTeX source code.
It also shows how to mix Thai with English using the babel package.
Since my research is related to multilingual dictionaries, I have the excuse of using this TikZ drawing of multilingual "thank you's" at the end of my presentations.
It had the advantage/disadvantage of distracting the audience enough from raising nit-picking, asked-just-for-sake-for-asking types of questions. :-)
If compiling this takes too long, the best way to use this is probably to use the result PDF directly via e.g. \includegraphics[page=1]{multiling-tq.pdf}
BTW -- can you spot the two fictional languages? :-)