My current quick list:
0. Spach, given the TE injuries
1. K. Washington, who may get some reps in lieu of TEs
2. O'Callaghan, given the likelihood he'll play jumbo TE
3. Hochstein, ditto, if the right guards get healthier
4. C. Jackson, especially in garbage time
5. T. Brown, ditto
6. Seau, on defense or offense, since he seems to spend some time in the backfield on both sides of the ball
7. Harrison
8. Sanders
9. Bruschi -- he scored a bunch once
10. Meriweather
11-14. The top 4 DL, in some order
15. Woods
16. Alexander
17. Baker
18. E. Jackson
19. Guittierez, who's unlikely to get the chance since Cassell needs reps
20. Gostowski, who is last except for the ineligible OL because he'd be more likely to pass than run for a TD on a broken play or fake.
Am I forgetting anybody, or does that list of 21 candidates suffice? I think Mankins or Koppen did get a TD recently, but individually the OL and Paxton still have to be last, I think, except for the ones who line up at jumbo TE.