My go-to recipe for Dad-cards is this: 

1 - start with a graphic piece of patterned paper with a great colour combo (stripes)

2- No colouring, just a cool and funky stamp that will make Dad chuckle. 

3- find some twine that coordinates with the colours.. 

I really love masculine cards... No muss, no fuss!

Have a great Father's Day! 

Stamp set:
Man Day by Technique Tuesday