I'm using a Nexus 5 and can confirm there is no Sense ROMs, this is because sense ROMs contain a special sense framework which usually needs to be ported. I'm not a clear user when it comes to porting of ROMs. But I feel like Sense layout won't be introduced the the nexus line in a form of a ROM.
There are external theming options. Like theme chooser which let's you theme your device. And there are plenty of sense 5.5 + themes for theme chooser. Theme chooser is available on most ROMs like cm, aokp, carbon, liquid smooth. Etc etc
The sash wringing... the trash thinging... mash flinging... the flash springing, bringing the the crash thinging the...
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