While I was traveling this summer I took along some hand piecing work. I cut a bunch of light and dark five inch squares from my green and blue scraps. I marked lines 1/4 inch to each side of the diagonal on all the light squares, then pinned each light square to a dark one (right sides together, of course). Then I hand pieced by sewing along the marked lines. Once the lines on both sides of the diagonal were sewn, I cut down the middle between the stitching and the result was two half square triangle blocks.
After I got home i put the squares up on my design wall and arranged them until I had a pleasing pattern. I used a sort of expanding pinwheel pattern, but lots of other patterns are possible.
Here is the resulting lap-sized quilt top. The finished blocks are 4 inches.
Blue Green Scrappy Triangles, 40 by 48 inches
I like the result and it was nice to have a portable handwork project along. Not very speedy, though. I probably could have done the quilt top in a day at home on the machine!
Mystery Bay Quilt Design 
Nice layout, Shirley!
I would like to buy the pattern for a twin size for scrappy triangle quilt in a twin. My grandson turns 12 in May and this would be a great pattern. He’s a huge video gamer and I’d like to find fabric with prints of 9ld and new games. I like to give credit where it’s due. Thanks.
Feel free to borrow the design as you wish. There is no real pattern for this — I just came up with a way of arranging half square triangles that pleased me. I’m glad you like it, and thanks for asking!