So did you know that the top category you put your etsy listings into makes a difference? It does - I'm not sure how much of a difference so I decided to put two virtually identical sets of valentines up for sale on etsy. One in the holidays top category, one in the paper goods top category. I'm very interested to see if there's a difference in views and sales between the two. I just found about this when I was putting Christmas cards on but I didn't get enough time to really try to answer the question.
I've listed my flat valentines - these are like postcards but with envelopes. Simple but bright and fun!