As stated in the first post, they need to be replaced. However, since everyone keeps asking, even though I already stated that, here's more info and pics ...

Two have alright tires that you can use as Temporary Rears and then the other two you should get some good used tires for like $10/ea to put on them since one of them has wires sticking out and the other one is kinda bald. My recommendation would be to replace at least those two and use them for the Fronts. I'll let you guys be the judge though, here's pics (click to enlarge):

I would recommend this one as one of the Rears:


This one can be used as a Rear as well:


Kinda bald, so should be replaced and used for Front:


Wires sticking out, so should be replaced and used for Front: