Garden arbor and brick path
Wind Stalks - DIY: make with ping pong and plastic balls on wire stakes and spray with looking glass paint
Easy enough and not toxic. Make Your Own At Home Weed Killer - protractedgarden
Gorgeous fire pit area.
patio and fire pit
Decorative indoor and outdoor stainless steel ball chain.
How about concrete over beach balls? No need to deflate them. The concrete will harden and be lighter than if solid.
Drill holes into your fence and replace them with marbles. Might be cool to integrate this somewhere on the property.