WHAT IS GOOD... Duplex

I am considering duplexing my information postcard so I have done a little research to see how I can go about it in a creative manor.

These are playful with their colourings and would work with the coloured pencil packaging I want to create. 

These are very crisp in their design, it almost looks like colour edging. These design are in line with my own colour scheme, I think the white writing works really well again the both the black and orange with high legibility. This is a design decision I can consider within my own designs.