Here is the idea I saw on Pinterest here:
Here is the box I made:
I made mine for Paul so obviously I couldn't do the same stuff as I would for a girlfriend of mine. I think I managed to keep it pretty manly!
I included: Yellow post-it notes, juicy fruit gum, Reese's peanut butter cups, yellow starbursts, lemon drops, tissues, swedish fish, and a bag of starburst jelly beans.
I found this print-out on Pinterest too. Get yours here.
And yes, I painted the box yellow & used yellow tissue paper.
This was so much fun to do and it didn't cost much at all.