I found a theme with a lot of pictures from flicker:
As I know, we can not use pictures except the library.
I want to know why can he use those pictures.
If he bought it, or those pictures are free to use?
You can use Flickr Creative Commons images, with attribution.
Did you purchased the theme?
I think only in the LIVE DEMO the author uses the pictures (I don’t think they are included in the zip file you download after purchasing – I may be wrong, and if I am, he has a commercial license for all the images).
_freshface, are those images provided with the zip file?
If you search the forums you can find many threads about this subject.
Anyway, what I’ve done was contacting some talented graphic designers and illustrators from Creattica and ask them if they allow me to use some screenshots of their work. In return, I put all the links they want on the credits of the file discription.
And, of course, I don not include the images of their work on the main files for download.
Hope that can help you!