The clicking noise when you depress the clutch pedal could be just be some wear on the throwout bearing, or any irregularity on the normally smooth surface the throwout bearing pushes against. I dont think there is much to do about it, except to listen to see if it gets worse, or begins to interfere with 'releasing' of the clutch. There isnt much you can do about clutch problems without separating the transmission from the engine anyway.
The round blue object on the floor of the car will need more description. How big was it - in width, thickness, was there a hole in the middle of it, etc. If you could take a picture and upload it to some photo hosting site, then put the link to it in your next posting - then we might be able to guess better.