After making several test liners, I ended up deciding that I wanted to get the actual invites before deciding on a final liner. I'm glad I waited - some of the liners I liked the best by themselves actually didn't look as well with the invitations as the final liner I went with.
Here's the liner we went with in the end:
Last tip - when making these, don't stack them in a pile while drying. I managed to stick several together because I was dumb enough to do this.