I love 2 week blitzes. Couple ideas:
1) you could do a heavy workout, low reps, heavy compound weights first in the day and then use your second workout to hit the SAME MUSCLES in isolation high rep movements.
2) you could do Lower body in the Am and upper body in the pm, then wave the intensity day to day---so like Day 1 would be heavy/low rep, Day2 would be light/low rep (think explosive speed work 50% 1RM x 3-5 reps), Day 3 would be moderate/moderate, Day 4 light/moderate reps (60% x 10 or something, no failure though), Day 5 heavy/low reps again. The light/low rep days are important to help your system recover in this layout. This would be more of a strength split, better with compound movements instead of isolation stuff. Doing this you'd have to avoid failure on each day.