Birthday is identical with cake and invitation card. You can make the cake design as the main theme of your card design. If the cake design is mainly from strawberry, we consider you to make strawberry Birthday card design. The card design can be 2D or even 3D card design. You can choose some material from 2D card such as paper or even fabric. It will be great if you choose 3D card design. You can flip up the 3D cupcake or strawberry cake with some candles from inside the card. The other idea is you can make the card design look like strawberry bar pack.
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