uhh, I never did that, but:
Hey, pretty stranger, I hope you are well and that everything is going well in your life, if not, I can't say for sure that it will get better, but, I hope this message helps, at least a little bit, in your search for happiness, and that, for a few minutes or even seconds, you will be happy, and that I (and the other people who text you), along with this little text, put a smile, or even a small grin, in your face. I wish you the best and even more. If you need to talk, I'm here for you, even though we don't know each other. :)
Well, that was my first time writing one of these, so I hope you like it! : D