Another zentangle birthday card, they are great for guys cards and you can make them as intricate and fussy as you like.
I stamped the greeting first then drew in the rectangular border.  Masked it then stamped some cogs and some dots.  The rest is doodled zentangle.

Inks:  Black document ink
Card:  black, white,
Stamps:  Stampin up Cheers and wishes, Sense of time and Circle of friendship
Other:   black Pitt pens, masking tape