Of course, you can. You just need to subscribe and cancel before 30 days.
You'll lose access to the creations, but they will remain thereto be re-stored if you decide to become a subscriber again. It's fair, isn't it?
Here is a step-by-step guide on how to subscribe for only one month:
1) You need to login and go to the payments page.
2) The payment is done with credit card using the paypal system. If you don't have a paypal account, you'll be asked to create one. It's safe.
3) The paypal will ask you a few questions and create a recurrent payment profile.
4) If you need just one month, make sure you cancel your subscription before 30 days.
5) Here is the step by step guide on how to cancel the paypal subscription. And here if you subscribed by credit card directly. It's easy, no worries.