Not a groundbreaking idea, but sooo effective (regarding mood-lifting issues!) :)
Yay, here I go again. Thanks for waiting ;)
Today I was confused about Mother's day approaching and grabbed my scissors and some colorful paper ... I came up with this (after crafting a card for my Mum).
You'll need colorful paper. And some chocolate, if you like.
Then create a heart shape or search for one online. Make a template and cut out many hearts... The more the better :)
Then get a string and some cellotape and put that whole thing together.