Started by creating rods in a helical arrangement

( .STL, .PDF, & .SLDPRT file attached)

Step 1: Initial Shapes

Trimmed ends of rods with tapered helix then added a swept circle for the side structures of the helix

Step 2: Adding Flair!

Added colored ornaments and star on top with hole for string or hook for hanging on tree

You design shows a left handed helix, but DNA is a right handed helix. Great idea.
<p>I never would have thought of that!</p>
<p>OOoh. Clever design. I dig the combination (and have always thought that double helixes looked like trees.)</p>

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