90th Birthday Card

Happy 10th decade. Ninety — and the card to meet it. Purple and slate blue overlapping geometric forms, a numeral built with the same graphic confidence as every card in this collection, and 'Happy 10th decade!' below in clean sans-serif.
 
The rarest of the milestone birthdays, and the one that most deserves a card that rises to the occasion. For the grandmother, great-aunt, or friend reaching ninety blank inside for your own words.