Hello, this are popup windows for users who are going to preview their new blogs. It says: 'Try your new blog design'.
This is a part of making new design for old blogging platform which is known as mmm-tasty (Russian Tumblr). There are around 600k monthly visitors, so I decided not to give up with the project and make it up-to-date and visually good (we made the project in 2008 and did not visually updated it since forever).
These are not just random pictures. Picture under the big text is background that users use to have on their tlogs (tumblelogs) and picture on top is users avatar. So each user would have their own popup window.
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