My mom had an embrodiery phase a long time ago. So now ive inherited all her thread too (i have almost every color under the sun!). I use it to make/stitch together my dolls and reconstructed clothes...since its thicker/stronger and i can only handstitch.
If i dont want it to be as thick, I usually cut the length i need. Then divide that thread into 3 sections (embrodiery thread has 6 pieces of thread stuck together, so pull out 2 pieces thread each). It'll make your hand-stitching stronger.
Well thats all i use it for too. I should really start actual embroidery though. lol