Go with whatever looks good to you. I think just a small amount of saturation adds the perfect pop. It look good to me up to around 116, then it starts to blow out a bit in certain scenarios, imo.Ah nice will pick the same value.
I saw this post about DeckyLoader's CSS Loader on Reddit. Pretty cool shit.
I didn't copy it exactly since I don't like custom text and centered home. I went with Switch-like home. I really like how it moves a lot of the Steam news and shit out of way and lets the artwork shine.
Here's how my Deck looks now...
I was trying to play Dust Elysian Tail and it wouldn't load. I forced closed it and went to the menu and DeckyLoader+Plugins were gone along with all my changes. I tried to restart and they were still missing. Went to Desktop Mode and ran the DeckyLoader script I had download the first time, then went back to Game Mode and it's all back to being customized correctly. Did a restart and everything is still customized correctly. Weird shit, but I'm glad the settings config for Decky was still present. Just a heads up.