I play a couple of fun putting practice games that I came up with (I'm sure others came up with the same thing).
1. Practicing aim. With three balls I start at 3 feet on a line with little or no break. If I make all three I move 2 feet back and putt three from there, if I make 2 out of three I putt three more from same spot, if I make only 1 of three or less I move 2 feet closer to the hole. I spend maybe ten minutes doing this and try to see how far away from the hole I can work myself up to.
2. Practicing distance. I do the ladder game. Find a spot where you have maybe about 40 feet of green to work with. Mark your starting point and use about 5 balls. Take your first putt about 3 feet out. Then take each consequitive putt to be a little bit longer than the previous. (when out of balls pick up all but the longest ball, go back to start point and continue). Ideally, you just send each putt about 6 inches longer than the previous. If a ball falls short of the previous you are done, start over.
Like you, I've completely neglected putting practice for a long time, but recently (since completing AimPoint Express) I've been working on it a bit. I actually practice at a facility that has synthetic greens. They're decent quality, but still nothing like the actual greens I'd play on a course. However, I can still work on my Aimpoint reads and on my speed control (overall consistency, not specific swing length for each putt distance).
So I got my first ever hole in one the other day. A PW on a short par 3, about 115. Never thought it would happen, ended up 2 over for the 9 holes. Not another feeling quite like it. It's been a picture perfect week for golf in the northeast. Any other aces recently?