I was recently surprised by the following drawing idea, black to move:
6k1/pR3pbp/6p1/1Q6/8/5nP1/PP1r3P/5K2 b - - 0 1
In this position black can play Nxh2+ and, no matter white's king move, move the knight back with Nf3 and make a repetition (or win!).
It is a win if white decides to run to the h1 corner because for example 1...Nxh2+ Kg1 2. Nf3+ Kh1 3.Rh2#. If instead white goes for the rook, then 1...Nxh2+ Ke1 2.Nf3+ Kf1 (only legal move) and we have repeated the position.
Is there a source where I can find a collection of drawing ideas like the above?