These ornaments are one of my new favorites.

Supplies:

• Sequins - use size and color of choice.

• Sequin Pins (3/4 inch pins)

• Seed Beads - I use what came in this kit

• Styrofoam Balls (I used 2 1/2 inch, but use what you want/can find)]

• Ribbon

• Glue (optional)

• Marker

• Take a bead and put it on a pin. Make sure it fits and will go all the way to the flat end. If it doesn't, it will stick off the ball to much and might break, that happened to me.

• Place the sequins where you want it on the ball. This can sometimes be a pain and sometimes it makes it easier (especially if you want it tucked under other sequins.

• Hold the head of the pin and the bead in one hand. Stick it through the center of the sequins.

• Push it all the way down as straight as you can and try not to move it around. It can sometimes slip and tear the ball a bit, but you should be fine as long as you don't do this over and over again and tear the Styrofoam ball apart.

• Do this over and over again in your pattern of choice.

• Okay, now that you know how, lets go ahead and plan the design first!

• Tip: I think the traditional is to put the sequins on is bowl down so it hugs the ball. But one idea is to do the background like that and then do the design with the bowl up to give it even more definition. I did mine with all the bowls facing the ball.
  

• Do your best to find the opposite ends, this is just nice for planning. I found the 4 quadrants of the sphere just in case, but I only really need to find the two ends to center my design.

• Using a marker, draw on your design (use a marker, a pen or pencil will indent the ball). This isn't going to show once the sequins are on.

• Start by filling in the background of your design. If you do the background first, your design will stick out better because you will see the full sequins pieces of the design. If you do the design first (as you can sort of see in my first one in the next step) it will get partially covered when you are doing the background because you want to cover as much of the ball as you can, and that involves overlapping sequins.

• When you get to your design lines, just skip over them. Fill in as much as the background as you can, but make sure you have left enough room so a sequins can fit in. You can just set one on to make sure. It will need to fit between all the pins/beads.

• Once you have your background filled in, you can move on to fill in the design.

(Source: Instructables)