I kept a journal early in my sobriety. I didn't always write in it, because I was such a jerk that I was constantly being given writing assignments by my sponsor: make a gratitude list, and it can't include anything you can hold in your hand or physically touch; define the words denial, God, acceptance; write a letter to your ex saying all the things you really feel;
These days, I use my personal blog as a sort of journal/captain's log, but I occasionally have to censor myself because people are reading it that I might not want to know what I'm REALLY thinking. So I might have to go back to journals and writing assignments.
I'm having a friend make me a couple of books (1 for recipes, 1 for crochet/craft patterns) that are going to have places for scribbling notes. I think the places for notes will be an opportunity to put my happythoughts about mom next to some of the recipes I have from her (food and mom and memories are so tightly intertwined).