King and Pawn Endings
Unfortunately, I haven't done too much by way of composing pawn endings, but I have produced a couple: one is explicitly a composition, while the other emerged directly from one of my tournament games. Here's the composition, which I created (discovered?) in 1986:
White: King on g3, pawns on f2, f4 and h4.
Black: King on g6, pawns on f7 and h5.
White to move and draw. (That's right: draw!)
The solution will be given in a few days.