Another script that looks very much like it could be the product of one person's imagination is the modern Yi syllabary. If somebody showed me a sample of this and I were not already acquainted with it, I would never believe that it is a natlang writing system.
The Yi syllabary is included in Unicode and a free font is available. If I had unlimited time and energy I would definitely recycle this script for some conlangerific or crytographic purpose.
Of course, the modern Yi syllabary was restyled to look more geometric, which is why it looks like someone jus created it. The older style looked much more "natural".
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