Here is a forum that contains many different mod patches for Super Mario 64. Some are pretty generic, but some are pretty good too, just have to sift through it all.

Here are some more Hacking docs for Nintendo 64, specifically for Mario 64 and Toad's Tool.

I would also like to ask if anybody knows of any more Super Mario 64 mods/patches out there that are any good? I see some very very nice work done with toads tool on youtube videos through google, but i never find any actual patches or anything for them, just people saying how "cool" they are. ANY links would be appreciated.