If you've been around long enough to remember Sony's PlayStation 2, you may be interested in checking out this PS2 Legacy Dashboard Dynamic PS4 Theme by Truant Pixel with some demo videos of it below! 
It was created for Sony Interactive Entertainment, and according to the developer will be available from December 6th in US and EU for 2.99 in the PlayStation Store.
Download: EP9000-CUSA07875_00-PSLEGACYTHEME001.pkg (13.5 MB) via Sametto Chan on his Discord Channel
From the video's caption, to quote: Legacy Dashboard Dynamic Theme by Truant Pixel
Created for Sony Interactive Entertainment. Available December 6 in US and EU for 2.99
We are pleased to bring you this theme, created with input from SIE US, Japan, and Naughty Dog.
After multiple prototypes over the last 2 years, each of which were designed to mimic functional aspects of the PS2 Dashboard, we have been given the opportunity to combine multiple disparate elements into a single piece of theme software which mimics the sights, sounds, and functionality of the PlayStation 2 Dashboard.
Upon starting up, users are treated fully recreated 'boot' sequence. PlayStation 2 logo cannot be used due to licensing restrictions, so we have taken an opportunity to create a mid-boot 'Easter Egg,' which changes randomly with every login.
From there, the "Seven Stars" make an appearance, coalescing from random points to recreate the mathematical and dynamic formations to accompany the passage of time, similarly recreated from the original PlayStation 2 bios in the form of the Crystal Clock.
Color shifting is now controlled via user input, with subtle shifts in particle speed and behavior. Additionally, original audio has been taken from the PS2 hardware and recreated in the background ambience and custom keynotes for this theme.
Lastly, as is our standard, this theme has been designed for 1080p, 4k/UHD, and OLED displays.
PS2 Legacy Dynamic theme “Making Of”
A "making of" video of our PlayStation Legacy dynamic theme. Be warned, This is an fairly dull technical discussion that may put you to sleep. My apologies
Cheers to @Jeff in the PSXHAX Shoutbox this morning for the news tip!
It was created for Sony Interactive Entertainment, and according to the developer will be available from December 6th in US and EU for 2.99 in the PlayStation Store.
Download: EP9000-CUSA07875_00-PSLEGACYTHEME001.pkg (13.5 MB) via Sametto Chan on his Discord Channel
From the video's caption, to quote: Legacy Dashboard Dynamic Theme by Truant Pixel
Created for Sony Interactive Entertainment. Available December 6 in US and EU for 2.99
We are pleased to bring you this theme, created with input from SIE US, Japan, and Naughty Dog.
After multiple prototypes over the last 2 years, each of which were designed to mimic functional aspects of the PS2 Dashboard, we have been given the opportunity to combine multiple disparate elements into a single piece of theme software which mimics the sights, sounds, and functionality of the PlayStation 2 Dashboard.
Upon starting up, users are treated fully recreated 'boot' sequence. PlayStation 2 logo cannot be used due to licensing restrictions, so we have taken an opportunity to create a mid-boot 'Easter Egg,' which changes randomly with every login.
From there, the "Seven Stars" make an appearance, coalescing from random points to recreate the mathematical and dynamic formations to accompany the passage of time, similarly recreated from the original PlayStation 2 bios in the form of the Crystal Clock.
Color shifting is now controlled via user input, with subtle shifts in particle speed and behavior. Additionally, original audio has been taken from the PS2 hardware and recreated in the background ambience and custom keynotes for this theme.
Lastly, as is our standard, this theme has been designed for 1080p, 4k/UHD, and OLED displays.
PS2 Legacy Dynamic theme “Making Of”
A "making of" video of our PlayStation Legacy dynamic theme. Be warned, This is an fairly dull technical discussion that may put you to sleep. My apologies
Cheers to @Jeff in the PSXHAX Shoutbox this morning for the news tip!
