Three right angled triangles are all that is needed to create one of these Flying Geese units (or patches.) The largest triangle piece is considered to be the "geese" piece -- (why it is not called a "goose" piece is beyond me). The other two identical triangles are considered to be the "sky" pieces.
Flying geese units are probably the third most commonly used patches in quiltmaking -- following the square and the half square triangle.
Free Quilt Block Pattern
The Poppy quilt block is a simple five patch block (so named as it is constructed on a 5 x 5 grid) and an easy one to construct. It contains only simple shapes, the square and rectangle, and another of the very common patches in quilt making -- flying geese. The simple circle shape that is the centre of the poppy is appliqued on top of the block as a last step.
As you will note, by rotating the block in a variety of ways you can achieve different arrangements that appear as "borders" for the blocks. You could also choose not to include the outer pieces (shown here in green fabric) for a simple poppy all on its own.
The sample quilts illustrated give you some ideas of possible ways to create your own quilt.