Do you send thank you cards to be nice or not at a

Well I tend to forget to send a thank you card if someone sends me something. But I have gotten better at it. I like sending gifts as a thank you. I think bigger is better. Well for me anyway. If I do send a card I make sure it sounds like something I would write. Do you send thank you cards? What do you send to someone that remembered you? That random act of kindness thing is cool too. I give what I believe they will enjoy and hopefully send me another card!