(Just my crappy, first attempt at a decent undertale theme.)
This art is not mine. It was found on google. Links to the pictures are below, though!
Sans Picture: http://40.media.tumblr.com/a873bb1bf36e79f7732713fbda95342c/tumblr_ny0i1bo6y01u6q4u1o1_1280.png
999999 damage background: http://ih0.redbubble.net/image.188728694.7207/flat,220x200,075,t.jpg
