This Build a Seam (BAS) Challenge is a little different - not exactly a stitch per se. It is a technique for making sequin flowers which can be a wonderful addition to a seam treatment or motif.
You will need cupped sequins for this - flat ones will not work properly - and some seed beads.
Mark your fabric with a center dot and five evenly spaced dots around the outside.
Bring your needle up through one of the dots on the outside and string on one sequin (cup upwards), a bead, another sequin and two more beads. Take your needle down through the middle dot. Carry on making another leg in the same way on each of the other four outside dots, always going down into the center dot which will be the middle of your flower.
This is what you end up with after you have done all five legs - a nice little sequin flower! You can add a bead or two more in the center of the flower if you wish. You can also vary the number of legs depending on the size of the sequins you are using. I hope you will experiment with this one - have fun!