Painted Acorns Diy . Use acrylic craft paints and a paint brush to paint your acorns. Use acrylic craft paints and a paint brush to paint. DIY Painted Pumpkin Acorns from www.gigglehearts.com Next, dry the acorns with a kitchen towel. Bake the acorns in a low oven for about 20 mins to get rid of any. Many of them were still on the acorns, but not attached.