Looks like a lovely boy, any pics of him in his tank?
Be careful with glass beads as I had heard via the forum that they can "leak" a toxic liquid from inside of them. I had a tank with glass beads in the bottom, but change to alternative substrate to be on the safe side.
Main thing is anything you make or buy needs to pass the stocking test I.e. If you run a stocking over the item and it snags, then it will also tear your lovely Bettas tail.
They like broad leaf plants to rest in, so ideally tall enough to be near the surface for them to chill. Amazon sword is a good plant, and very hardy.
If you want artificial plants go for silk, as plastic will rip his fins.
Tell us more about his tank please
. Was it cycled?
Lastly, please take care what you put in his tank when you mention making your own. Certain plastics will leach into the aquarium, hence better to get those designed for aquarium use or use food grade items. Also, sadly I recently lost a lovely girl who got stuck in a planting object within the aquarium, I cut her free with a lot of difficulty but lost her from the injuries with a couple of days. Hence just check that the nosey Betta will not get stuck in anything you add to the tank.