Making a tassel with embroidery floss is easier than you think!
You only need a few supplies.
Really, all you need is the embroidery floss, some thin cardboard (think cereal box cut to a little longer than you want your tassel), and scissors. For my method, I also use a jump ring and jewelry pliers so I can incorporate the tassels into jewelry. Additionally, you might want some strong glue and a comb with fine teeth.
I've got a video on the process that walks you step-by-step of how to make your own Embroidery Floss Tassel.
But, here's the quick and dirty of it.
Start by holding a short tail of the floss at the base of your cardboard.
Wrap the floss around the board. More wrapping means a fuller tassel. I tend to wrap 10-20 times.
Cut your floss.
At this point, open your jump ring with the pliers.
Carefully slide your floss off the cardboard. Slip the jump ring through the top loop of all the floss and close the ring.
Cut several inches of floss from what you have remaining.
Wrap that bit of floss around all your floss, just below your jump ring and tie it several times.
Trim the excess floss and glue it if you'd like. (The following pictures don't have the jump ring in them - my bad, sorry about that!)