As I've noticed in another thread, many modders are going to play through the game and add their own little notations on various things they'd adjust. Since I won't be buying this for console as I had for MORROWIND and OBLIVION whatsoever, actually helped with mods I wanted to use before purchasing them for PC, I'll be giving SKYRIM a major playthrough and start posting ideas when the SKYRIM Mod sub-forum gets created.
Of course there're many mods from MORROWIND and OBLIVION I'd more than enjoy seeing ported over to the Creation engine for SKYRIM. But that'd be another thread.
For example, in OBLIVION I walk from x to y to z with many other distractions along the way. Sometimes I see a particular door or certain particular individual things I'd see changed. So in effect I download singular specific mods instead of bulk ones. My reasoning is keep it looking stock for Bethesda type stuff, very high resolution which would be 4096x4096 or greater and won't look largely out of place in the games environments. I have made my own collected mod packs out of the various ones I've downloaded since, as mentioned, I prefer to choose selectively as to which mod to download.
One greatest thing for OBLIVION is of course enabling the invisible walls/barriers on the game world to be turned off and creating the rest of the Tamriel continent beyond the game area. More for exploration of course since it is in fact one of the greatest things The Elder Scrolls series has had ever since ARENA.