One of the favorite (of my plants) homemade mounts I've ever used is palmetto bark. I've also mounted onto live palms, and the orchids throve.
Since I haven't managed to talk my husband into helping me cut down and section a large dead palmetto in the back of this property yet, I'm going to try a small queen palm I got ahold of. The texture isn't quite is rough, but I got my mom a little nodosa to give me for Christmas, and it's begging for a mount. See how it works.