Well, right off the bat I think including recipes would be cool if is cooking inclined. This being because you can include recipes based off of what the letter topic is. You can include a stress relieving smoothie or something for "open when stressed", a dessert for "open when feeling down", a recipe for something that you BOTH like for "open when thinking of me", etc.

Printing funny or inspiring images from Google is also another option. Like not just photos of you, but like funny photos or romantic Valentine's Day-esque images.

I'll add more as I think of them.

Oh I really like these.!
I might have all my topics done, I'll post them here.
Not in any order really, I'll put them in a more logical one when I actually start making them instead of brainstorming.
I have 25 already, but I can easily add more if people come up with good ones.! (i have 50 envelopes. hahah...)

1-Missing me
2-Sad
3-Happy
4-Can't sleep
5-bored
6-You need to know you matter
7-You need to know I need you
8-You feel like we need to break up
9-On Christmas
10-You're worried about me
11-Missing me *wink*
12-You're stressed
13-Had a bad day
14-Need a hug
15-you're doubting yourself
16-on your birthday
17-On our anniversary
18-When Im too much to handle
19-When you're mad
20-When you need a laugh
21-Open incase of a zombie apocalypse
22-You need to know how much I love you
23-You're feeling self concious
24-When you decide to propose
25-You're on the plane

different 'missing me' ones could also be you reminiscing about the times you two have spent physically(in the same room, i mean) together. Assuming you have, that is. If you haven't, maybe any specific webcam chats/dates that you had that were particularly memorable.

oh, and 'When you need a kiss' one, put on some lipstick and kiss the paper. You can adapt it for holidays, like a mistletoe kiss or a midnight kiss for new year's. Even if either of you are not a lipstick person, it's actually a cute way to almost directly transfer a kiss, and it's visible, too. or tinted lip balm, since that's much less clunky and has the same general effect!

though...what will you write for a zombie apocalypse? can't really send weapons in the mail. oh, but an MRE would be funny, if you can get your hands on one! something not perishable, lol


OH, for christmas, a handmade ornament, something maybe small and flat, but that it means something to you. oooh, maybe like two flat clay hearts with a red string connecting them, kinda long but that's because the hearts have to be hung from separate branches. and a bonus, put a magnet in one and a bit of metal in the other, so when you're together you can have the hearts meet when they're hung!