Well ... technically not combinations, but jump sequences:
Triple loop - half loop - Triple Salchow (3Lo+1Lo+3S under COP)
Triple Salchow - half loop - Triple Salchow (3S+1Lo+3S under COP)
I think most skaters' patterns on these jumps are too "tight" to make these feasible.
Elena Sokolova kinda did the reverse of the first one here http://youtu.be/0Qlus-LyywM?t=2m29s
Here are few more rarely seen sequences:
Triple Lutz - half loop - Triple flip (3Lz+1Lo+3F) by Alexander Johnson http://youtu.be/Y-1AI1fXdiE?t=1m35s (great free skate)
Triple flip - half loop - Triple Salchow (3F+1Lo+3S) by Elena Radianova http://youtu.be/BnlHq18c0Fk?t=1m17s
Doubla Axel - triple Loop (2A+3Lo) by Miyabi Oba (such a Miki Ando clone) http://youtu.be/NijJ3571Is8?t=1m1s
Any others? I would love to see a triple flip - half loop - triple flip!