I made my sona during my hardcore Saw fan phase. This is why she's a pig and has a red-black color scheme as Jigsaw and his disciples wear pig masks and red-black robes.
She's not a Saw OC per say, just loosely inspired by the Saw series and that inspo lessened as I reworked her design over the years, including giving her white hair when I became a sucker for them.
For suggestions, take this with a grain of salt since I'm not a furry despite my sona being an anthro lol, but maybe make the sona's species your favorite animal and the color scheme whatever your favorite colors are. There's probably a specific reason why there's so many blue dog songs out there on the internet; people like dogs and the color blue, so naturally when they want to make a fursona, they may be more inclined to make a blue dog sona.