CustomizedGirl made some great logos and designs for Oktoberfest. Unfortunately she is twisting the "public domain" idea and implying you have to link to her website. That isn't true. This is public domain. You can use this as much as you want with no obligations. Feel free to link to her if you want though.
This is a completely free image Oktoberfest - Text that you can download, post, and use for any purpose.
Image License: CC0 No Rights Reserved
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission, and at no cost. This image is completely free.