I have tried everything to change the PayPal image at checkout in magento 1.9.1 CE.
We set up PayPal standard which also enables PayPal Express. We are not using any of the premium products from PayPal, just standard.
Apparently you can only change that image if you have one of their premium services, payflow pro, etc.
We want to switch the image to a credit card Paypal image. Our customers don't know we can take any credit card though PayPal.
I tried editing:
mark.phmtl, shortcut.phmtl and logo,phmtl.
No luck, still shows the default logo.