In that book, Dorian receives a book by Sir Henry Wotton.. allegedly—according to Oscar Wilde himself in his trial—that particular book is "À rebours" by J.-K. Huysmans, 1884. So naturally because I did tell you was going to put a book in her book.. dawg. I re-created "À rebours" as well. And based it on the first edition, first printing of that one as well.
Here's a huge picture of the basic progress because.. well you know the old saying, "A picture is worth more than a thousand words".. well.. Here's 9000 words for you. Not including the preface. My apologies for the final picture being kind of blurry and crappy.
Editors (still me) note: Yes, The Picture of Dorian Gray was technically first published in 20 June 1890, in the July issue of Lippincott's Monthly Magazine. But, that one doesn't really have a book cover—so to speak—to base anything on, so I went with the first edition, first printing instead. However the book itself is still the 13 chapter non-revised edition. Not the 20 chapter edited for less homo-eroticism. So there. Enjoy the picture(s).