I would really like to see some new icons on old champs. 
(there are more) all got some pretty good looking icons for abilities and passives.It would be great if you made some new icons for 
as well .
and 
are getting a rework soon anyway but the others are kinda outdated.
GreenLore1 votesWell several of the ones you listed are also on their Update-list,so it wouldn't make sense to update their icons now if they'd have to redo them again once they get their updates.
Sealed Avatar1 votesWell judging by the speed of reworks,we will have them updated in more than 1 year.It's just small icons,it doesn't take too much time for one artist,let alone a whole team of them.