Here's an example of a great hobby electronics type gift card http://prntscr.com/5lsr8u Don't use anything from this design; our needs to be uniquely our own! But it gets you thinking :)
I'd prefer if the design didn't have a big fluffy bow / ribbon in it.
Recently we had a banner made for our affiliate program called "Pro Maker", While this has nothing to do with Gift Cards, hopefully you can use some of the design queues from it. The designer did a great job 'complimenting' our brand logo https://core-electronics.com.au/cus…-maker.png