I say "y'all" from time to time, especially when speaking with my family, but I don't have an accent otherwise. I've never used "all y'all," but I have used:
donchall (don't y'all)
yaller (y'all are)
djall (did y'all)
"Ainchall" was at one point in my regular vocabulary as well, but I think I've suppressed it.