So far there are many sites that can help you generate a QR code that points to the bitcointalk.org site. You can create one with a logo, but you may have to pay a small fee for the service.

Try doing so here, but please verify your own privacy and security if you wish to use this site: https://www.qr-code-generator.com/

Here are some examples of QR that lead to the site bitcointalk.org (official site).