I'm looking for the exact code to add a design or picture as a background, not to the page itself, but just to the components and entry backgrounds. What function does this go under?

And secondly i can't seem to get my calendar how i want. I've done the edit the minicalendar tutorial and thats all in there. But it didn't change anything. I'm trying to get borders around each box, if anyone knows what i mean, please help.