68 known values for trail with current usage counts:

1. default (28702× used)
2. fluff (11057× used)
3. yellow_dots (6525× used)
4. red (3018× used)
5. blue (2016× used)
6. paws (1681× used)
7. green (1588× used)
8. fire (1304× used)
9. rings (1293× used)
10. earth (1080× used)
11. ice (938× used)
12. arcade (924× used)
13. red_neon (846× used)
14. stardust (721× used)
15. flowers (659× used)
16. ice_dust (634× used)
17. blue_neon (571× used)
18. fire_dust (560× used)
19. shadow_dust (546× used)
20. sakura (533× used)
21. shadow_tail (413× used)
22. magic (406× used)
23. crimson (394× used)
24. autumn_leaves (372× used)
25. digital_3d (361× used)
26. fire_tail (342× used)
27. abstract_3d (336× used)
28. elements (328× used)
29. ice_tail (293× used)
30. magic_tail (285× used)
31. magic_dust (212× used)
32. wish (208× used)
33. black_and_white (184× used)
34. stars (80× used)
35. speedy (76× used)
36. tech_path (60× used)
37. pollution (59× used)
38. red_dots (58× used)
39. tracks (51× used)
40. siren (47× used)
41. green_neon (46× used)
42. feathers (41× used)
43. leaves (41× used)
44. propulsion (40× used)
45. snowflakes (39× used)
46. treasure_map (38× used)
47. aaaaa (32× used)
48. zzzzz (29× used)
49. pumpkins (28× used)
50. festive_tree (28× used)
51. lunar_fireworks (23× used)
52. twinkles (22× used)
53. ghost (21× used)
54. dots_inc (21× used)
55. blue_plasma (20× used)
56. bubbles (19× used)
57. bomb_fuse (17× used)
58. money_trail (14× used)
59. red_plasma (13× used)
60. rainbow_light (13× used)
61. lucky_trail (13× used)
62. rainbow_dots (10× used)
63. spacewar (9× used)
64. confetti (8× used)
65. meteorite (6× used)
66. gold (2× used)
67. musical_notes (2× used)
68. gold_dust (2× used)