I am very fond of the basic patchwork - nothing fancy, very scrappy. You can even do them as seasonal - I have one with just Halloween fabric and another one that is all Christmas. They are fun and quick. I usually use 5 inch squares.
Another one I have done is Turning Twenty. But instead of using Fat Quarters I just bought 1/4 yard of fabric and adjusted the pattern squares from there. Then when the blocks were put together I used a sashing between them which seemed to high-light the fabric in the squares. Wish I had a picture of it, it was really fun to make and super fast.