I saw these super simple notecards on pinterest. just 3 strips of washi - not even cut. and a simple sentiment.
really, it can’t get easier than that.
I have soooo much washi I could make 100s of these.
I did cut and fold the cards myself. I have tons of envelopes I got from the reuse store near me but I generally make my own card blanks unless I can find a really good deal on them.