I repotted a few pots 2 weeks ago using a nice looking organic soil that I got from a nursery and yesterday I was horrified to see what started growing, mushrooms :(
Ugly looking, growing everywhere little things. I think the soil either had some unsterilized mushroom compost or was infected with spores.

So, what do I do now? Do I ignore them? Do I repot again? 
Is it possible to add anything to the soil to stop them growing?

I put the pots in the direct sun, it may help a little but they grow at night so not much. During the day they dry up and then the new ones come up, very frustrating.

hey, they are fun guys leave 'em be :) lol yeah.. leave the containers in sunny spot and they will go away. but once it rains, they will pop up again. i have some containers with same shooms.

Pull them out.

Danny, I keep pulling them out two mornings in a row but they grow faster than I could ever imagine :(

Pete, it is good to know that I am not alone.
Not exactly the answer I was looking for though since it is hard to enjoy your figs or show them to anybody else when those ugly things are growing.

they wont hurt, if anything they will decompose some of organic matter and make it easier for the tree to absorb

They won't hurt anything. 

I kinda like seeing them growing in the posts. For when they die back the nutrients will be used up by the fig trees. 

Part of my current soil mix is composted mushrooms. 

Ok, thanks, guys! 
I am gonna tell my figs that they shouldn't loose their figs because of them mushrooms!

First determine if they are edible.

They are living on something compostable, so if not edible, you can leave them there to break down whatever. Remember, they are just the fruiting organ, so removing them won't remove the fungus. I imagine that if the medium were a bit drier, it would become inhospitable to your unwanted guests.

Dale,
These mushrooms are not familiar to me. I grew up picking mushrooms so I know just a bit about the shrooms I used to eat.
You are correct about the moisture, the mushrooms need a lot of it. I was worried that their presence would indicate that something wrong with the container environment but it seems I was wrong and the figs should be just fine. I put the pots in the direct sun, will see the results in a few days.
What kind of medium the mushrooms prefer, acid or alkaline? It seems the soil in the forest is more on the acid side.
I was thinking to add some lime to discourage them a bit (and help the figs).

greenfig, check out this shroom growing out of the bottom of this pot. Today I found a few more like this.
"gene"

Couple of issues:

1) your potting mix stays too moist. Let it dry completely before each watering.

2) Test the ph of the run off. Most likely your medium is on acidic side. Orgainc potting mixes and compost, usually have an acidic ph. And mushrooms thrive in acidic environments.

If you use rain water to water your plants, make sure to find out what is the ph of the rain water is. Usually the ph of the rain water is acidic.

You can spray fungicide on the the soil and the mushroms, it will kill them. But their spores will remain in the soil. To kill the spores in soil, water your plants with a 1:3 solution of 3% Hydrogen Peroxide:water. That solution will kill any remainingo mushrooms or their spores in soil, it also kill any fungus Gnat larvae that might be present in the container(s)and Pythium (root rot). The extra Oxygen molecule in H2O2 will provide the roots with some needed Oxygen.

Navid.

The compost I have delivered starts in a mushroom farm. I get them all the time. No big deal!

Since I have several pots with mushrooms, I will try the Navid's approach of using the Hydrogen Peroxide. Letting it dry completely might not be good for the figs, they are some this year cuttings, will die or be extremely unhappy about it.
Thanks for the hint to check the pH. I was thinking the chemistry was on the acidic side.

Gene, I is a quite happy X-rated pot :D

I put sand in the bottom of each pot and a layer on top , this prevents Fungus gnats and shrooms, also serves an insulator from the sun, helps a little , maybe

they will do absolutely no harm to the plant. but do not eat them.