Prism, I have three favorite quilting teachers that are my MAIN (but not only) inspiration:
Angela Walters (I have both books that QuiltingShorttimer mentioned), Judi Madsen (I have both of her books), and Lisa Calle (I have two of her DVD's, one of her books, and nearly ALL of her longarm rulers).
I have to say that Lisa's style of teaching is what helped me design my corner settings for my Lone Star... I love her style, and I love her tools. If you were only able to get ONE - I'd get Lisa's "Divide and Design" DVD. Absolutely AWESOME!!!!
Here's what I will be putting in my Lone Star corners... (my backing arrived today, so this is the next thing to go on my frame)