Is this going to be possible?

Would it be possible to create different page elements in Photoshop, besides the header, like an interesting border or footer or buttons, and import them into designs made with Themeframe?

You can certainly add background images which give the appearance of borders just like you can in Atahualpa. There is no "special" functions for that sort of stuff. You just have a whole lot of flexibility.

I just released Beta 14 which includes a feature to import your custom images as new Drag & Drop items. It fully works as far as I am concerned however you cannot remove the custom images again (from the design you can, but not from Themeframe itself). And, it doesn't deal with importing images that already exist, yet. I'll include this in the next version in a couple days.

Absolutely cool. I think this is going to be one of the killer features of Themeframe that will break it out beyond the limits of other "design" systems that don't exactly allow design like Themeframe!