All of the ones in the last picture are common creek gravel. The other two pieces are worth a closer look. The large white one looks like a spear point or something.
I noticed these are your very first posts Mitzib - so, Welcome Aboard! You didn't list your state (or country) in your profile. So, you might consider jumping over to Sub-Forums: Select Your Area.... and selecting location information (i.e., clubs, hunts, finds, legends, maps, etc.) directly related to your state (or country).
He meant the bottom left one in the first two (duplicate) pictures.
In addition, you have at least one which is a concretion (bottom right in third picture), and one which was, with 95% confidence, colonized by sea critters (middle one in third picture with hole that goes all the way through). The ones with pits that do not go all the way through may possibly be the result of water dripping on the surface over many, many years.