You can get extensions for the end of your gutter that are flexible--most of the ones I have seen are green plastic. Better yet dig a trench and add on drain pipe--you can use that flexible corrugated black pipe for that. Get that water diverted out of your run to begin with! Like Tad I am a big fan of a thick layer of wood chip. It is free in most cases and easy to move around. If you don't like it, no big deal, change it out in the summer for sand and compost it.