I use photoshop too, I pick up my ideas from tutorials too, or if I already have a good inspiration to begin with.
The last one I did was for Innocent lilies. I picked my idea from one of the original image, which was a king of stained glass.
Or I used a photoshop tutorial for the design I made for the french wall of The Heirs:
with this tutorial: http://www.photoshoplady.com/photoshop-tutorial/making-a-castle-of-imagination/