DIY Acorn Marble Necklace - Here's an easy nature craft, marble craft, gift idea, beginning jewelry making tutorial, and unique rustic party favor for kids and adults. Made with natural acorn caps, these marble charms make a beautiful acorn pendant for handmade jewelry and homemade ornaments. This simple acorn craft idea for kids and adults also make wonderful DIY home decor as hanging window decorations (house or car review), lamp pull cords, and more!