Frost Rabbit
This was literally a pattern of the frost on a window. O_o
If you look at it as the dark parts being window, then you can kinda see it. I didn't change anything about the pattern, or at least, I tried to copy as well as I could. ^_^ This sketch is pretty recent.
I used a regular no. 2 pencil, with a mechanical pencil with no. 5 lead for the little details. (Like the frost pattern on the right side) I had to darken it in Photoshop a bit 'cause it didn't scan well. What you see is pretty much what it looks like on paper.