Hi Alex,
welcome and it’s great to see you on LTH. I hope you’ll also have a chance to post here about stuff out your way, because many people here regularly travel to Southern California.
Regarding your question about unusual salsas, here are some pointers to past posts (with photos) that might be of interest.
La Casa de Samuel serves a fantastic pasilla chile salsa with their cabrito al horno.
(7th picture down, post by G Wiv)
http://lthforum.com/bb/viewtopic.php?p=99911#99911
Erik M has a picture of a creamy green salsa at Taqueria Tlatzala and some discussion of what might be in it:
http://lthforum.com/bb/viewtopic.php?p=33185#33185
The new Yucatec place, Xni-pec, of course has salsas with chile habanero, both a relatively mild one (the xni-pec) and a much hotter one containing only habanero.
Xnipec salsa picture here, in a post by Antonius:
http://lthforum.com/bb/viewtopic.php?p=113272#113272
Habanero salsa – kind of hard to see, but in the tiny pitcher near the papadzules, 6 pictures down, in this post by G Wiv:
http://lthforum.com/bb/viewtopic.php?p=113281#113281
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There was a little hole-in-the wall place that closed before Antonius and I could ever post on it, which had some interesting salsas. Maybe we can add more details about that later.
-- Amata