Theme that can take images w/o distortion?

Hello on my blog I tried posting little drawings (comics if you want to call them that) that are 800xwhatever. Well, at 800 pixels width they distort the two themes I have installed so I fear that the same will happen to new themes.

Are there any themes (preferably like the one I have now http://www.wowyoureugly.com/blog/) that will stretch with a bigger image?