The Deep Dream Generator is free and easy to use. Just upload a picture and chose a style. You can also upload your own style and tweak the settings. I used a couple of pictures from Pinterest.
Does not look like it is free. It is a free trial that entails registration, giving contact details and more.
@Fred_Snerd
No, I did not see a way to upload a photo without creating an account
@Fred_Snerd
I stay away from having to create an account, give all personal details before knowing what works. You do that once, twice and before you know your e-mail box starts to get bombarded with messages that don't stop.
@Fred_Snerd
Log out, clear browser cache, close browser and start again or use another browser?