I didn’t trace the first pattern you shared because it’s easier to lay it out correctly for a seamless texture without tracing it. I did import the image as an image so I could see it for reference without having to look at my other monitor.
Then I exported a PNG with a transparent background and opened it in PaintDOTNet.
Magic wand to select the transparent region outside the border of the pattern.
Edit>Invert Selection.
Image>Crop to Selection.
Then Save the image.
Import into SketchUp as a texture.
For your second one with the curves and leaves, I might trace it. If you could find a high res image of it, you could use TIG’s image trimmer to convert a PNG with transparency into geometry or create a BMP image and use Spirix BMP Tracer to get the geometry.