I've taped the end of some thin metallic thread to the back of the circle and threaded it between the scallops to another gap, a few spaces away, and then just continued to thread all around the circle until each has been filled. The closer the first distance the bigger the hole in the middle will be. This technique is known as Spirelli.
I've used Kaiser paper for the back (unthreaded) circle, border and greeting, and inked some white gloss cards with a variety of pinks for the light and dark circles. The smalled one has a heard die-cut from the middle and is mounted on foam tape to add depth.
You have almost certainly guessed that the base card is from Regal Craft Cards. If you want to make a more "masculine" version, why not go for cogs instead of scalloped circles and change the colours.