@dylansan - Thanks! The '16 wheel colours are meant to match the '94 mirrors. I've actually got the entire GT1 Race Mod database that I did as a little personal project a few years ago, so that's what I work off of. It's a little hard to make out some of the pixelated sponsors though, so I take some creative liberties there.
I only got into doing them when I couldn't find the ones I wanted in the marketplace in FM3/4. Finding a Del Sol LM was almost impossible! Getting credits for it is a nice perk, and seeing your cars online feels cool. I haven't come across any tutorials I could recommend, but I know they're out there. For me, it's been a combination of measuring logos I like, and simply tracing them, and sticking the tracing paper to the screen. Quickest way I've found to recreate logos. There are definitely tutorials out there if you want to get into advanced design stuff though.
That colorful Civic was based off the real-world JACCS racer (though I think that might've been an Accord). I'm not sure I have the patience for that right now

. I have two more in the pipeline - one a new application of one seen here, the other, a redo from FM4 - but after that, I'm not sure. Maybe I'll look into GT2 after all...
@ZDUPH - Ah, so that's who that was! I've actually seen the Puma GTO in the livery section, but it's pretty half-assed, so I wouldn't recommend it. Some people have no care for accuracy. Glad you like the MX-5, cheers.