Here is the mail monster she drew on the return envelope, with the mail monster I created (collage).
And the stamp I used to send it back is the global rate moon, shown, obviously, at Night, with a dark blue background. It was issued in 2016 and the rate back then was $1.20. Then in 2017 the rate was cut to $1.15, where it will stay through at least 2019. (Image from Eva's blog).I like to think the mail monsters are more active during the night.
The Moon stamps come in a sheet of ten with a great background (none of the other global rate stamps look so nice, being printed on white).
For more of the mail monsters, click here.
For more nice stamps with an N theme, check out the links at Sunday Stamps.