can some one give tell me a free or cheep program that can make nice perty blogs?

I'm a little confused. Your title says blog graphics, but your post says you want a blogging system? I'm not sure what you're talking about if you are talking about blog graphics, but if you want a blogging program, there are tons you can try. There's
http://wordpress.org/
http://b2evolution.net/
http://cafelog.com/
http://www.movabletype.org/
There are a lot more, but those are the most common I've seen. I hope this helps!

I can't figure out how to word this but i want something that makes the back part of blogs.

so you want to know how to make a page background?

Could you find an example as to what you want? Then maybe we'd understand better.

The blog image? You can use any graphics program, like Paint Shop Pro or Photoshop, or MS Paint, or the free program GIMP.

paint shop pro offers a 60-day free trial: www.jasc.com