Flooring for home lab
ESD is a matter of how much intermittency or damage you can afford. In a medial device, or aerospace application or other industry the costs are very very high into the hundreds of millions (or a human life) for a failure. In these cases every available option to mitigate ESD risk is taken, which include floor mats, wrist straps, humidity control (60% if I remember right), making sure no materials that promote ESD (like paper and plastic) come into contact with electronics and even monitoring the local electric field. The cost in time and money is also high.

Even in a regular production environment, the costs can be high (for scraping a few hundred dollars worth of components). 

In your case, since your costs of failure are quite low (if you ESD'ed a MOSFET, that's ~1$ and tens of minutes to troubleshoot whereas a mat is 10's of  dollars or more) and the costs of ESD mitigation would be higher than a few components, it may not be necessary to go to such great lengths for ESD lab coats and ESD flooring. It might be better to just use wrist straps and an ESD mat for educations sakes and call it good. 

For a proper ESD floor, the floor needs to be conductive and connected to ground (with 1MΩ of resistance between the user and the floor), proper footwear that is conductive is worn with a foot strap. I'm not aware of any home materials that would satisfy the conductive requirement.