Well, lot of things could happen. Worst case is authporities will place you in jail for check fraud.It will also affect credit ratings.I would suggest stopping
To continue to write checks on a closed account constitutes fraud, and may subject you to both civil and criminal charges. Fines and/or jail time may be imposed.
Don't. If convicted you may have trouble finding a decent apartment to rent for many years afterward. Landlords run names though public records looking for that sort of thing.