68 known values for trail with current usage counts:

1. default (28587× used)
2. fluff (10868× used)
3. yellow_dots (6437× used)
4. red (2989× used)
5. blue (2000× used)
6. paws (1661× used)
7. green (1569× used)
8. fire (1303× used)
9. rings (1294× used)
10. earth (1084× used)
11. ice (935× used)
12. arcade (919× used)
13. red_neon (850× used)
14. stardust (719× used)
15. flowers (653× used)
16. ice_dust (626× used)
17. blue_neon (575× used)
18. fire_dust (556× used)
19. sakura (531× used)
20. shadow_dust (526× used)
21. shadow_tail (399× used)
22. magic (399× used)
23. crimson (395× used)
24. autumn_leaves (375× used)
25. digital_3d (363× used)
26. fire_tail (333× used)
27. abstract_3d (332× used)
28. elements (318× used)
29. ice_tail (288× used)
30. magic_tail (279× used)
31. magic_dust (213× used)
32. wish (208× used)
33. black_and_white (172× used)
34. stars (77× used)
35. speedy (75× used)
36. tech_path (60× used)
37. pollution (58× used)
38. red_dots (50× used)
39. tracks (45× used)
40. green_neon (44× used)
41. leaves (42× used)
42. feathers (41× used)
43. siren (41× used)
44. snowflakes (38× used)
45. propulsion (37× used)
46. treasure_map (37× used)
47. aaaaa (33× used)
48. festive_tree (29× used)
49. zzzzz (28× used)
50. pumpkins (28× used)
51. lunar_fireworks (23× used)
52. dots_inc (21× used)
53. twinkles (21× used)
54. blue_plasma (19× used)
55. bubbles (17× used)
56. bomb_fuse (16× used)
57. lucky_trail (14× used)
58. ghost (13× used)
59. rainbow_light (13× used)
60. money_trail (12× used)
61. red_plasma (8× used)
62. confetti (8× used)
63. rainbow_dots (8× used)
64. spacewar (7× used)
65. meteorite (4× used)
66. gold (2× used)
67. gold_dust (2× used)
68. musical_notes (1× used)