My iPhone 5 earbuds don't fit my ears and fall out by just turning my head, I have to cram them in and they still fall out. I've designed support clips that slide on the stem of the earbuds and hook comfortably around the ear. Using the clips my Apple earbuds are comfortable and won't fall out :-)
If there's interest in this solution I'd be willing to offer a couple of different sizes.
If you really need these but don't have access to a 3D printer I'd be willing to print these and drop them in a first class envelope for a small fee, a good way to pay for more plastic :-)
I printed this thing in ABS using .15mm layers at 20% infill. I ran the STL through Netfab so it is clean and ready to slice.
You can set the depth of your earbuds by swapping the clips, refer to the photos, the clip is always in front of the ears.