I have to agree with scroggs on this one. After a PPL, you won't have the knowledge to build hours contructively on your own. You will pick up bad habits, and you will be at risk. Those hours just after PPL are known as "The Death Zone". Do constructive flying to get your hours up, maybe add a night rating and an IMC to your licence. Instructors and airlines, etc., do NOT want to train or employ unstructured hour builders because bad habits picked up can be so difficult to erradicate.