Postcards remind me of the pen-pals I had in grade school – the accompanying picture makes it so much better. :)
I'm the (stay-at-home) mother of four girls so anything pretty or in pink/purple would be preferable; we also like "cute". Scenery from your hometown or country, or something cultural, would make a great conversation topic for homeschooling.
And could you remember to write the date? Thanks.