I can't stand the slogan Pure Michigan
Agreed. The slogan is bad. But that doesn't mean the design is bad.
the blue wave on the bottom makes me seasick
I'm guessing not...
and having a website on a license plate is stupid.
Yeah, I think it's silly too, but at least it isn't as stupid as California's great idea to put the DMV's website on it...
I don't get the appeal of the solid color plates so many people seem to love.
It isn't just solid color plates. I'm generally in favor of license plate designs that feature muted-to-no graphic elements with the serial number in a starkly contrasting color. These two factors together make for an easily legible license plate, which is kind of the whole point of having them in the first place. So, for example, the turquoise NM plate passes the first test but fails miserably at the second. And, while I think using a close-up of the state seal was a pathetic direction to go in, Kansas' current issue passes both tests. And that's what I like about the old blue Michigan plates: not only are there no graphics getting in the way of legibility, but the white and blue are a great contrast.
There's only twenty or so unique color schemes you can do, so that means that you're going to have to have some duplicates between the states.
Yep, and that's totally fine. I remember when Iowa looked like Michigan looked like Connecticut, Arizona looked like Missouri, Pennsylvania looked like (old) California, and New Hampshire looked like (old) Washington. I couldn't always be 100% certain when license plate spotting from the other side of the Interstate on a family road trip, but so what? No problem otherwise.
Something like the Sacred Rain Arrow plate Oklahoma used during the Henry and early Fallin administrations is the best sort of design, in my opinion. Something visually interesting that doesn't interfere with the numbers at all.
Agreed. The sunbelt design used immediately before that one was also good—one of the best, IMHO.