Time for another DIY project!
I love bangles, I think they're perfect during the summer but you can easily make a winter version too.
This is what you'll need:

If you're a good knitter you can surely make wonderful bangles, otherwise fear not! Even if you can't knit (like me...) you can make a nice wool bangle! If you can crochet (hence the hook in the photo above) you'll have no problems at all, but if you're neither a knitter nor a crocheter, you can use a piece of pre-made knitted fabric (old sweaters too!)...the possibilities are pretty endless!
Take an old/cheap plastic bangle and measure it all around. Remember: the larger the better. You'll cover it with wool all around and the finished bangle will be smaller.
Make a paper pattern of the bangle, doubling the height. This point is not a must, but it will be useful when you'll have to knit/crochet/cut your piece

Knitted fabrics can be pretty stretchy, so make your piece a bit smaller than the paper pattern. Check it on the bangle: it has to be tight but not too much!

Using the needle and the same wool (or a similar yarn) of the knitting piece, start sewing it on the inside, all around

Then sew the edges together...

...and you're done :-)