If you don't have vintage hardware and just want to see what the "Holo" interface looked like, downloading a ROM for an emulator is the most practical solution.
Boot into recovery (Power + Volume Up). Select "Backup." Save to external SD. Android 3.0 Honeycomb Rom Download-
Android 3.0 “Honeycomb” is a tablet-focused release of Android introduced by Google in February 2011. It was the first Android version designed specifically for larger-screen devices (tablets), with a new holographic UI, system bar, and action bar to improve multitasking and app navigation on tablets. If you don't have vintage hardware and just
Do not download ROMs from untrusted sites — they may contain malware. Prefer established developer threads (XDA) and check user feedback. with a new holographic UI