I went to dollar tree and got colored note pads but you could use regular paper or formal letter stationary if you’re fancy and can afford to spend a lot on it, and I already had a “Christmas box” which is where I’ll kept them hidden but you could use a tree box or go to Marshall’s that’s where I got mines they have them. Then envelopes if you want to “enclose” them I’m do some enclosed and then keep a journal for my thoughts :) a mini one