okay now the paper texture, because I haven't made the edits myself, I still to mess around (i'm a bit of a n00b) but what the theweaver did was just make a new background in entries and remove the old one in the entry footer.
.entry {
background:url('LINK HERE') center bottom;
}

however if you just wanna change the texture itself, locate ".entry .footer, .comment .footer" and you will see the background code there

I hope these two comments help!