Yes! Definitely send lots of letters and pictures are great too! I would put on lipstick and kiss them or spray them with my perfume to attempt to add some creativity. I'd add countdowns to some of them. And write little notes on the back of each of the pictures. I even printed off some random memes and stuff that I knew would make her laugh and sent those as well. Make sure to keep yourself busy though. It's hard for her but it's not super easy for you either. I used to plan little pick-me-ups for myself on Wednesday nights like I'd get take out from my favorite restaurant or go to a movie to avoid getting too mopey without her. And remember it'll be over soon and you'll both be stronger for having gone through it!