How cool would it be if my 5th Edition Homebrew campaign started using Percentile Ability Scores?
What I mean by this is each ability score (Str-Cha, 1-20) would also have a percentile element. Each time you leveled up, you would roll 1d100 and add the result to your percentile element. If it exceeded 100, you would add +1 to the relevant ability score, and subtract 100 from the percentile portion.