Just a built version of this
https://github.com/SlyryD/stardew-valley-randomizer
adding some of my onw minor changes.
Check https://www.nexusmods.com/stardewvalley/mods/5311/ for all the info.

Things that weren't there in the original, but are in this:

From 0.5.0, by dtomlinson-ga:

• NPC Preference Randomizer (credit to Vertigon)
• Reworked the NPC skin randomizer so that most NPCs can be randomized with each other - exceptions (perhaps we can address these in the future as well):
  • Dwarf and Krobus, as they're too small
  • Pam and Willy, as they have fishing animations
  • Henchman and Bouncer, as they don't have that many sprites
• Fixed the rain, animal skins, and NPC skin randomizer settings potentially affecting the RNG for other things
• Added animal skins and NPC skin randomizer settings to the spoiler log

GMCM support added.

From certifiableGrimalkin:
Option to show songs being replaced in HUD.
Critter randomisation has been reworked. You can now add custom groups of critter sprites, any combination of critter may be randomised, and I added an option for every frame of a critter to be randomised to a different group of sprites.