Yea, that was me that was considering making my own the tie-dye cover(s). In fact, that may have been some of my first posts when I joined RUKIND.
Anyway, its been discussed and certainly has been done. There were numerous pics posted from those that have tried it. Some were pro (HardTruckers), some homemade, some even used old t-shirts. I think the material was the key factor. Too dense and your tone could possibly be muffled. I did a few "practice" covers and temp stapled them to the existing frame of my Super 60 combo. While they gave me an idea what they would look like, the cheap craft store dyes just didn't do it for me. I had every intention of ordering some better dyes and colors from Dharma or one of the on-line supply companies. I just never did. So, its been discussed, do a search for the thread. There are various ways to approach this, and like tie-dying, there really is no wrong way to do it.