When my mother-in-law turned 80, I made a "gift tree" hung with ball ornaments (they were clear and split so they opened up) with different denomination bills totaling $80 inside. This was so much nicer than just a card with money . . . she had a blast opening the balls to see what was inside... and I don't know that she ever really noticed that the total was $80 - the same as her age. I was able to find what I needed at Michaels.