In recent years (the last decade or so) the church has begun using painted murals in temple endowment rooms. The rebuilt Nauvoo Temple is an excellent example. I suspect that gathering the artists for this project and having murals painted in a new temple was a catalyst that got the church to use murals in all new temples again. I can't confirm it, but a lot of the details required for the Nauvoo Temple have started showing up in other temples including murals.
The original Nauvoo Temple lacked murals. It was completed (with some parts only roughly done) shortly before the Saints fled Illinois and headed to Utah. This, and the fact that murals didn't begin being used until the Logan Temple was built in 1884, meant that the temple didn't have murals. The rebuilt Nauvoo Temple was decorated with grand details that the saints probably would have added given proper time and means. I think the murals are well done and have some interesting aspects.
The artists intentionally emulated the Hudson River School of painting popular in the mid 1800s so the work would fit in with the historical nature of the temple (see this article). At the same time, they clearly have created a fusion style as features such as nebulae viewed from the Hubble Space Telescope in the creation room murals would clearly not have been painted in any art in the 1800s.
Below is the creation room mural. One notable feature is that the landscapes are based on east coast locations with New England shorelines representing the newly formed world. This starts a pattern that is completed in the world room where the history of the church is played out by referencing notable locals. Starting in New England, the church eventually made its way to the west.
I would love to hear what you think about these murals, so please comment.