Do you ever find yourself doodling romantic or funny sayings? Why not get paid to write greeting cards?
For example:
Are you a true romantic? I remember seeing Blue Mountain Arts greeting cards on display at Spencer gift stores years ago. These greeting cards were mostly romantic. Also, anything else serious would be good. Pretend you are having a lengthy and serious conversation with someone, then write!
Totally funny stuff but not mean or vulgar. Pretend you are joking around with a family member or a friend! Whether for a birthday, anniversary, etc., think of common occasions.
Of course, he mentioned others, but I think the above two are the ones most likely to work out.
Now get out those doodles and send away! Good luck!