I bought myself a leather iPhone 6s case. Brought it to one of those kiosks that does engraving and had them imprint F sport with the lexus logo. Ill take pictures sometime this week to show you. came out pretty nice. Looks like this AMG case my pops got. (got my idea from his case lol)
I think its best to go with a company that will brand a phone case for you instead of finding one made by Lexus. And that way you get more control over the ultimate design too. If you do want one from Lexus then you'd have to check out a dealership.
That just brought to mind the idea of 3D printing, surprised with how cheap it is for something low production to happen that no one has done this yet. Engraving in the same font as the Lexus badging will serve the community well!