I just use ultra-stretchy, mid-weight socks--I cuff or peg the jeans, then pull the socks up over the arrangement to hold it in place. My favorite socks for this are washable wool, ribbed socks that come to mid-calf. This system keeps the ankle area smooth, and the whole things stays in place very well.

Oh goodness ladies... rubber bands and tucking into sox?? Yuck, too uncomfortable. Get some JeanGrabbers! Have been around for a few years now, slick little things, and super cute. http://www.jeangrabbers.com
Also, they just released a very cool-looking boot organizer that doesn't take up any closet space!! I've been meaning to order one... maybe I'll go do that now!