I agree with Eleryth - if you can find something fringey in a cotton, expecially, dyeing would be a quicker route than making yourself, though it may take a little experimentation.
A pic might help! Is it a leathery type fringe or stringy fringe? Either way I'm sure you could fake it.
Another option is to find a knit fabric (they don't really ravel, though they can curl a bit) that fits the color you need, cut a long strip slightly wider than the length of fringe you need, and simply snip the fringe pieces with scissors - leaving a solid strip at the top, of course, so you can sew it into the skirt. If this doesn't create a dense-enough fringe, you can just layer the strips to make it look fuller. Like I mentioned, knits can curl a bit, so figure out in which grain direction it tends to curl and cut parallel to it - if you cut perpendicular to the grain, the fringe would curl up on itself rather than vertically along the fringe pieces.
Another possible option, though probably not ideal, would be to buy fabric in the color you need (preferably in a heat-stable non-stretchy material) and use fusible webbing/interfacing to stabilize the fabric, then snip into fringe - I used fusible stuff to stick trim on my Belldandy cosplay jacket, and even though I made the trim from cotton, after the webbing was on, it never frayed. Of course, it wasn't dangling like your fringe would be, so this is only an oblique thought.