While looking stuff up for another post I found a collection of every coverart for every intellivision game. Some really fantastic art in here. - eviltoast
Intellivision Complete Game Cover Collection - Arcade Punks
www.arcadepunks.com
Here is a complete case cover collection for the Intellivision I posted this last year…

I really liked this cover for Thunder Castle. Never even heard of the game but this is the type of fantasy art I crave. Gameplay doesnt look too bad either!