The new rules for Tourist Visa then became effective in August and now it is much easier to extend your stay in Thailand.
Doesn't matter if the person got 30 or 60 days permit to stay on arrival then before the stamp expiring date just go to an immigration office, fill in the form, make copy of your passport and two picture (all can normally be done at immigration office).
If all is right the officers will grant a 30 days stay, fee is 1,900 Thai Baht
After those is possible to get seven more days, same procedures and fee
Then will be time to leave the Kingdom of Thailand and make a trip back
Thsi avoid the long and time wasting visa runs that are now story of the past, for tourists