68 known values for trail with current usage counts:

1. default (27934× used)
2. fluff (9712× used)
3. yellow_dots (5963× used)
4. red (2767× used)
5. blue (1837× used)
6. paws (1490× used)
7. green (1467× used)
8. fire (1305× used)
9. rings (1304× used)
10. earth (1069× used)
11. ice (940× used)
12. arcade (927× used)
13. red_neon (836× used)
14. stardust (717× used)
15. ice_dust (587× used)
16. flowers (583× used)
17. blue_neon (569× used)
18. fire_dust (547× used)
19. sakura (525× used)
20. shadow_dust (474× used)
21. magic (395× used)
22. autumn_leaves (388× used)
23. crimson (385× used)
24. shadow_tail (337× used)
25. digital_3d (326× used)
26. fire_tail (307× used)
27. abstract_3d (273× used)
28. elements (272× used)
29. ice_tail (253× used)
30. magic_tail (240× used)
31. magic_dust (201× used)
32. wish (181× used)
33. black_and_white (82× used)
34. stars (72× used)
35. speedy (71× used)
36. tech_path (60× used)
37. pollution (51× used)
38. tracks (47× used)
39. leaves (43× used)
40. green_neon (42× used)
41. feathers (36× used)
42. red_dots (35× used)
43. siren (34× used)
44. snowflakes (31× used)
45. treasure_map (30× used)
46. propulsion (29× used)
47. festive_tree (28× used)
48. pumpkins (28× used)
49. zzzzz (28× used)
50. aaaaa (26× used)
51. twinkles (23× used)
52. dots_inc (21× used)
53. lunar_fireworks (19× used)
54. bubbles (14× used)
55. rainbow_light (11× used)
56. bomb_fuse (11× used)
57. lucky_trail (11× used)
58. rainbow_dots (9× used)
59. blue_plasma (9× used)
60. confetti (8× used)
61. money_trail (8× used)
62. ghost (8× used)
63. red_plasma (5× used)
64. spacewar (4× used)
65. meteorite (3× used)
66. musical_notes (2× used)
67. gold (2× used)
68. gold_dust (2× used)