If you loved Justice League: Throne of Atlantis, try LEGO DC Comics Super Heroes: The Flash
A bridge between a film you've already seen and one most people haven't. LEGO DC Comics Super Heroes: The Flash has roughly 4.2× fewer votes than Justice League: Throne of Atlantis — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.

Justice League: Throne of Atlantis

LEGO DC Comics Super Heroes: The Flash
What they share
Both films are directed by Ethan Spaulding, and they both carry the playful mood tag, and they sit in Adventure / Animation / Science Fiction territory. If that's the register that drew you to Justice League: Throne of Atlantis, the second film will land in a comparable space — through a different lens.
What LEGO DC Comics Super Heroes: The Flash is
Aimed squarely at the single-digit set, this one does what it says on the plastic brick. The Flash is stuck in a time loop, forced to repeat a very bad day again and again. It's probably a mercy that the filmmakers didn't have the budget to trap the audience in there with him.