This Idea kind came to me when thinking of a simple skill system for S&W or OSRIC. My Idea is to port over how percentile systems like basic roleplaying system or Rune Quest do skills. All skills start as 3, 5 or Cant be used unskilled. Most all unskilled skills start at 2 with the first skill point applied.
Skill points are applied to the starting value of a skill. Then attribute bonuses are added to get the number needed to roll. For example Aurstin a ranger has the tracking skill. Being a ranger he starts with a base skill of 5. He has applied 4 of his starting skill points to tracking. Aurstin has a wisdom bonus of +1. So his total skill level is 5+4+1= 10. So on a roll of 10 or under Austin's skill check would be a success.
One of the reasons I really like this is because I use attribute checks for most on the fly rolls. This would unify most of my d20 mechanics for these systems.
The Only was to truly unify all d20 rolls is to use a form of descending Armor class with a roll under system. Interesting. Very interesting.