For beautiful reference I suggest taking a look at Deviantart.com, as many of our comrades in interest display their work there. Also, since I have taken a few gleaming gems myself of brass and cogs, I suggest playing with light and atmosphere until you find what appeals. The innards of a pocketwatch, teacups and brass keys. Old leather bound novels and inkpots, a parasol or two.
As for the technical issue you are referring to with GNU, I am not so schooled in this. Perhaps the aether would have a bountiful supply of information if you know where to look.
With hopes that your endeavor pays off, Miss Penelope Stanhope