How to make aurorae decorations

Hello all, i am trying to create a new decoration for aurorae, i’ve followed some guide (not very clear), but i cannot make it as i want. I would like to create something like that


but the only result is this
svg2.
There is some NOOB guide to make what i want? Thanks

Have you checked: https://develop.kde.org/docs/plasma/aurorae/ yet?
It might help to check out the structure of some themes along the way.

The structure itself isn’t rocketscience so I’ve got a feeling you’re really looking how to make the svg.