The twin star quilt block is one of those blocks that gives the impression of a star but is easy to put together because you don't have all those seams meeting in the middle.
To make this twin star as an 18" quilt block you will need:
Lay the twin star pieces out as shown: one gold square in each corner and in the middle, one green triangle along each edge of the central gold square and the small red and gold triangles along the diagonal edge of each green triangle.
Sew the red and gold triangles together first and then sew this combined triangle to the green triangle.
For the third row again make the green/red/gold square first and then add a gold square on either side.
You now have an 18" twin star quilt block which would look good as a bag or as a cushion.