I like how Cate combined collage & watercolor. I also like that I spy some of my mono leaf printing on Deli Paper on the card above, as well as some other collage bits I sent -fun! Cate also did a bit of collage on the back of her cards, which is a great idea if you wish. Keeping it plain is fine too.
Please try to write your name & email on the back of your collages so your recipient will have a way to get in touch with you. Thanks & happy arting!