You could do a magic nine patch. It is simple but turns out very nice. You make 31/2 inch strips and number from 1-6 then you make strip sets 1-2-3, 2-3-4, 3-4-5, 4-5-6, 5-6-1, & 6-1-2. Cut into 3 1/2 inch segments. Make blocks by sewing Block A (1,2,3 - 2,3,4,- 3, 4, 5) & Block B (4, 5, 6 - 5,6,1 - 6-1-2). Now alternate Blocks A & B. Makes diagonal lines of each fabric. Hope this is not too confusing.
Susan