This time of year I love fishing the big FOAM dries with the nymph dropper. This loop has been around for a long time but, I just remembered it.
I normally tie a longer piece of tippet to my leader and use the tag to tie my HOPPER on, then the longer piece (sometimes up to four feet) for a nymph or a scud, etc.
This occured to me today while I was tying some hoppers. For those of you who are not familiar. It is a piece of mono (in my case a heavier, like 10lb., flouro) tied in a loop at the back of the hook, then tie the fly as you normally would.
Now you just tie to the loop your tippet with the dropper. It leaves the Hopper hook open for bites.