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Designed by my daughter, who has allowed me to upload it as some of you may also like it :)
Printed with no fill, no floor and no roof with 2 shells/perimeters. I printed this in natural PLA at 0.3 mm layer height, and it took 3 hours to print.
I used http://3dp.rocks/lithophane to convert the image and merged/unioned it with a cylinder for a shell only print.
I've changed the lithophane generator so that you can produce these STL files directly from the image file without any post processing. Just select '360 solid shell' under 'Form:'