A while back we featured the Eyelighter by Westcott. It gives really gorgeous catch lights and helps to provide fill and light from the bottom. A little after we saw a first DIY version of the Eyelighter which involved bending PVC pipes using hot sand and an industrial fan. While the results of this DIY were really nice, not everyone wants to go through the efforts connected with bending PVC pipes.
Here is an easier (though not as sturdy) alternative for building a DIY Eyelighter courtesy of Isiah Xiong.