Oh. I'm supposed to be Catholic. I am in a purely Catholic family. I have to go to church every Sunday and sometimes Saturday, even sometimes Thursday.
I'm Agnostic, but I don't want to tell my parents.
Try Dolliecrave, Totallylayouts, and search in the tags of tumblr for keywords, for example "cute theme". I got my current theme from Dolliecrave.
They all have their pros and cons, so it's up to you to decide where to get your theme.