More creative blocks. Such a feast for the eyes.
Vikki--in addition to what's been said, are you starching and pressing everything well? What kind of thread are you using? If you're marking lines (like for HSTs) is your marking line narrow or thick? It should be narrow. Try sewing a smidge to the left of that line. Also, those directions that say cut pieces with a 7/8 fraction, go ahead and go up 1/8", then press open and trim down. When you find the perfect sewing line, you might want to put a piece of bright tape on your needle plate.