If the carpet is not worn out or has holes in it, you could use dye on it. I have done it on Sun faded carpet and it looks like new. Make sure you vacuum it real good and with vinyl gloves on,(wish we had those years ago) and a lint free rag. Mix it up,put it in a spray bottle, and rub with rag a little to blend it in. I have seen some people use a spray dye/paint in a can on carpet, and it looks like they used a brush with latex paint from their basement. Lumps, carpet pile stuck together, etc. This way you are showing "The Little Woman" that It's NOT that big of a money pit!!!! Also after the carpet dries....YOU can take the kids out for some ICE CREAM with the money you saved, and yell at them to" Eat it faster before it melts all over the carpet!!!!!"
It looks like the car had heater core leak because the whole passenger side of the carpet is now brownish (not green like the rest of the carpet). I guess the owner just dried it and never pull the carpet to clean it. Would something like this clean up or I would have to dye it? The replacement carpet for my car is about $150 and comes in two parts. Maybe I could just get the front part and pay half the price?