Great idea this, though if you included all my textures that are resources in the pack, it would add over 300MB I suspect.
Perhaps themed texture packs might be a good idea. That way, it would be easy for a modder to select textures for a specific need as well.
Some important comments from me:
Credits and Distribution:
We should only include textures that have the all-clear to redistribute in another texture pack. Some sites, like Mayang for example, are quite strict about that. Also, it's vital that full credits are given clearly to the original photographers and texture artists who made the textures/photos we used to make textures. This can be tedius I know, but it is quite possible. Take a look at my readmes for a good guideline on how to do such credits. I try to be quite meticulous in this area.
Legalities:
It's easy to do google searches for photo and texture searches. But it's not OK to use the results of such searches in other work without making sure it's OK. No matter how tempting that photo might be, if there's no OK's on using it, it's not OK to use. Including phrases like "creative commons", "OK to use", "public domain", and such makes it easier to narrow down a search. I did this recently when searching for photos of cheese, and found a magnificent site loaded with all sorts of photos, all OK to use:
(EDIT - There are a few photos that aren't Ok to use, but they are clearly indicated and in a separate section.)
http://pdphoto.org/index.php
(Took the rest of my evening downloading all those cheese pics, and I was quite hungry for cheese while doing it too. ^_^ )
Any photo or texture included in these pack(s) should be legally OK to use. If they're from a site that doesn't allow redistribution of the textures on texture sites or texture packs when the photos/textures are simply tweaked, cropped or tiled, then that site should instead be included in a list of good free and OK-to-use texture and photo sites.
Usage in non-TES projects:
Some of us mod for other games as well. I'm currently doing a dungeon tileset for Fate for example. Include whether it's OK to use your textures in other games. Obviously if the texture used a Morrowind or Oblivion texture as a tempate it's not OK I realize.
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Legal technical stuff aside, I'll get "a few" links up soon for some of my work. I have one nice advantage in that I have an area at elricm where I can upload all sorts of fun stuff like packs of textures, so I'll likely be doing links to download sets along with links to lower-res jpg examples. I'm currently obsessing over starfish at the moment, so it may be a few days. Expect a texture pack soon with starfish, jellyfish and seashells with nice solid black backgrounds, similar to how I did my flower pack.