My taste is 'the plainer the better' (apart from natural finishes which I don't like much). Conversely, I don't like anything 'flash' at all. Flamboyant body shapes and glitzy paint, gold hardware, exotic woods with elaborate grain patterns, multiple pickups, too many control knobs and switches are all red flags for me.
At the other end of the scale, I don't like relic finishes. It's all fake and trying to be something it's not. I could tie my bass to the back bumper of my car or bury it in the garden for a week but what's the point?