I have presented before a random stripes generator under organic stripes which unfortunately doesn’t exist any more.
Luckily there are now two new ones, the random stripes generator and the weighted random stripes generator where you can enter amounts :)
Links:
Random Stripes Generator (Random Stripe Generator)
Weighted Random Stripes Generator (Random Stripe Generator (Weighted))
Here at unikatissima:
Organic Stripes