This model was based on pg.75 of a wallpaper sample book on the Brooklyn Museum website. The wallpaper was originally made sometime between 1875 and 1917 by Morris & Co. Ltd.
I took the image and edited the image in GIMP and then traced it using the 'Trace Bitmap' function in Inkscape. Then I manually edited the trace to remove all "extraneous" isolated islands. Then I connected all the remaining shapes to each other to ensure that there is connectivity between all pieces and the frame.
I have also provided the OpenSCAD source code and Inkscape file. I used OpenSCAD version 2018.09.05 (git 40af343) to render this STL.
It would be really cool to see this made using a laser cutter, paper cutter, or CNC so check out the SVG file if you want to make it that way. If you like this design then check out my other "Art Nouveau Silhouette" design with a similar style:
Printed at 4mm high instead of the model height of 8mm with the standard 198mm square x and y dimensions. Print took about 10 hours to complete.
BE CAREFUL when removing from your build plate since you need to work down each "branch" from the edge to prevent pieces from breaking off.