My older boats....
When I was a kid, my dad's boat has a blue and black astroturf. it was really thin, but thick enough.... You had to sweep it of crumbs at the end of the day if you ate chips, etc. on it.
It wasn't that bad...but the bare gel coat is a breeze to clean compare to that. I'm sure hydro turf is way better, but if you are really looking for cheap, that might be something worth looking into.
I lined my front compartment with astro-turf to dampen the anchor and chain as it's stored...not too bad.