Visual

[12345]

I want to repeat background pic. As default file is png, and I need jpg. And I need change color of text example: register here or forgot password?(lightgreen). Its in default template folder. CSS file I think.
I also would like to do that on main page after login buttons: My account, My adopt, Message center, will show, but if logout buttons are not showing

[BMR777]

I think you can do this with the theme's CSS file at templates > default > style.css. Unfortunately I can't help much as the graphics are not my strong area.

[Ashje]

Go into your CSS and find this:
body {
background:url(images/bg-body.png) repeat-x top center #E8F7F9;
Change to:
body {
background:url(images/bg-body.png) repeat top center #E8F7F9;

That will repeat the background in the default theme. It's simple, just remove the "-x" from repeat.