An interesting idea would be to do a search over your old games and find all the ones that were 0.5 point wins/losses, or at least pretty close, and take the final board position and make those in to problems. I still find it possible to count the same -finished- board position 2 or 3 times and get 2 or 3 slightly different counts, especially when you factor in captured stones and komi; it's just really easy to lose track of a point here or there (on that subject, if I have to count playing cards to make sure I have all 52 I usually count twice because about 25% of the time I'll count wrong and have to do a best 2 of 3, so the core problem might be that I just suck at counting things in general).
I've been meaning to do this with my own games at some point but I've been super lazy. If I manage it at some point I might post it here.