Hey gang,
 
I have an X32 board, and I can use a wireless app on Android and iPhone to allow people in the studio to set their own personal monitor mix (up to eight for now).  The issue I have is the outs on the board are mono balanced, and the eight channel headphone amp takes a stereo (of course) 1/4 TRS input.  Does anyone know if there is a ready made cable that would support this?  It seems I am stuck making my own cables, but with the popularity of the X32, there must be others doing this, so I'm left wondering if there is an alternative.  Or it could be that I'm just doing the whole thing wrong.

Aux outputs from mixers have most always have been line level mono. They can be balanced or not depending on the price point. 
The intendend use is to send signals to monitor systems which are normally mono. 
In a live situation those outputs would be driving a few floor monitors and the IE transmiters. 
Some IE  transmiters have mono and stereo input options. 
A hardwired system will require a headphone amp as you say you have. 
You don't mention what the brand or model the headphone ampe is so can't say what will be happening, but generally you get 8 mono mixes or 4 stereo. The chioce is yours. Mono is really all you need for recording. 
 If the headphone amp has only TRS headphone input(s), then you'll need so many "insert cables"  1/4" TS x2 to 1x TRS. If it only has one input then all you get is one stereo mix. But only guessing whithout more info about the amp.
 

This link may help you:
http://www.rane.com/note109.html