I’ve never done a theme tree because I tend to decorate with the handmade ornaments I’ve made every year since nursery school, but a “sea” tree could probably look spectacular.
There are a ton of excellent jellyfish ornaments out there (something about the delicate tentacles really lends itself to gorgeous craftsmanship).
They range from incredibly intricate handmade creations to less complex mass produced versions, and use a variety of materials (glass, shells, plastic, crochet, beads…) but they’re all rather charming in their own right.
(Apologies for not citing each image source, but hand pain does not allow. Three cheers for Google image reverse search!)
SheWalksSoftly 
2 responses to “Image Odyssey: Jellyfish Ornaments”
I had no idea there were so many jellyfish ornaments around. It’s true, though, they really lend themselves to it. You can have a lot of fun with those tentacles!
This post had me thinking of what other materials/techniques I could use to make jellyfish ornaments. I’d like to sculpt a series of them with modeling clay.