Bobby Blues offers a few massive downloads of thousands of DX7 patches (compatible with the TX7 as well), for free.
Encyclotronic had a download of a bank of patches designed by Brian Eno, from a 1987 Keyboard Magazine Interview, but those seem to be no longer available for download. I've re-created these patches using Patch Base, and you can download them here: Brian Eno Yamaha DX7 Patches. View the original post from Encyclotronic.