adding ruffles

[quiltedknitter]

I'm making a basic garter stitch scarf & would like to add something to it. It's just kind of plain looking. I thought a little ruffle or decorative edge on either end would look nice. I know I probably just pick up stitches and maybe do an increase. But how much?
Yes, I'm a newbie..... So any suggestions are welcomed.
Or if there is something else equally as simple...
No fringe please.