Just look at these beautiful square in square blocks made by Anna Maria Horner for the Rainbow Around the Block charity bee:

I made my own square in square block the other night, combining some of my favorite fabric collections.  It's so bright and happy - I love it!  I hope Sun Squares makes you smile:

I could not find an online tutorial for this style of block, so I had to wing it.  After a tiny bit of trial and error (I used photoshop to measure Anna's inner blocks), it came together pretty well.  Anna Maria is going to post a tutorial for the square in square block on her blog soon.  I'll update this post with a link when her tutorial is up.  You can download Anna's PDF tutorial here.