Are there any vendors out there selling ready-made templates? A quick google search takes me to an outdated filemakerthemes.com
Are the included themes insufficient (or deficient)? Keep in mind that in the future a bunch of them will be deprecated. Software Update: FileMaker Pro 13.0v4 and FileMaker Pro 13.0v4 Advanced release notes | FileMaker
I suggest you also study how themes are saved with a file and how to optimize within a file.
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