In the following list you can find all Galaxy Nexus Jelly Bean Roms (Custom and Stock).
- LIQUIDSMOOTH » JellyBean [4.2.1] Beta 2 [Maguro] » 2nd January
- LIQUIDSMOOTH » JellyBean [4.2.1] Beta 2 » January 2nd
- PURITY v3 ♦ POWERED BY AK KERNEL
- Jr12 (JOP40D / 4.2.1): MoDaCo Custom ROM for the Galaxy Nexus
- PARANOIDANDROID 2.99 betaNINE (22.12) | New innovations
- XenonHD Stable-1.5 (30.12.12) *Happy New Year*
- JELLYBAM – v3.3.0 [29/12] [I9250] [PA.AOKP.CM10] [CHRISTMAS TIME]
- TEAM SHOGUN RufDroid 1.2.1 +Stable +MultiTasking +Battery
- MiNCO v6 (Minooch + Franco) [22.12.2012]
- JBSourceryV4.1-GSM [12/18/12] ALL NEW JB 4.2.1
- **Cataclysm** Xmas 2012 Release [18-12-2012 Update]
- Team EOS 4 *JELLYBEAN MR1* Nightlies — Maguro
- AOSP R8 Jelly Bean 4.2.1 JOP40D + Kernel v3.0.57 Linaro
- 07/12/12 Unofficial PACman All in One Rom v18.0.0 | Fast | Stable |
- Galaxy Nexus 4.2.1 stock (deodexed, rooted, busybox)
- Android 4.2.1 JOP40D: Rooted Busybox Deodexed/Odexed (11/29/12)
- Dark Passion – Unofficial ParanoidAndroid 2.54 | 4.1.2 | Fully Inverted |STABLE
- MIUI.us Weekly Release-MIUIV4.1 for Maguro- 2.11.9 w/ Miui.us Toolbox!
- Dark ParanoidAndroid | 2.54 | 09.11.2012 | Per App System, Hybrid, blah.
- /// ATOM [v1.25][11/6]
- 06/11/2012RC3-BrassDroid!! WITH PHOTOSPHERE!![GSM+TORO][Fast][PowerSaver]
- Android Revolution HD 7.0.0 | High Quality & Performance | GSM | Legendary
- Codename Android 3.8.0 [JellyBean] [10/20/12]
- Wasabi MIUI – Spice Up Your Maguro!
- Slim Bean ( Maguro) [All Languages]
- BAMF Paradigm v2.4 [4.1.2] JZO54K 10.25.12
- Maguro Nightly Kangs
- AOSP Jelly Bean & AOSP+ Neapolitan Flavored
More information here
Thanks to benkxda.