Yes, you are right! xD
I bet! >w<
Hmm... not sure, I haven't used GIMP in a lonnnnng time, I'm sorry. >w<
I don't know of one for free, the safest way to do it in my opinion is just Google images - search the texture you want, click on the image, it will only enlarge it not bring you to the site, then use the snip it tool to create a file. Although if it's for the book I would make sure it is free use/creative commons! xD
You're welcome! In fact, I am not sure if mine is creative commons or not, should check. .w.