This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
Two kaleidoscope patterns are derived from an image and used as frame mats. There is also an optional "Margin" outside the outer kaleidoscope frame that can serve as another mat i the corners are not rounded. The bevel setting determines the proportion of the inner and outer kaleidoscope frames, and there are controls to set the portions of your image fed into the kaleidoscope.
frame mat rounded corners double image kaleidoscope components controls
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.