68 known values for trail with current usage counts:

1. default (28583× used)
2. fluff (10839× used)
3. yellow_dots (6436× used)
4. red (2983× used)
5. blue (2000× used)
6. paws (1647× used)
7. green (1571× used)
8. fire (1302× used)
9. rings (1292× used)
10. earth (1083× used)
11. ice (936× used)
12. arcade (921× used)
13. red_neon (845× used)
14. stardust (718× used)
15. flowers (657× used)
16. ice_dust (627× used)
17. blue_neon (576× used)
18. fire_dust (556× used)
19. sakura (531× used)
20. shadow_dust (524× used)
21. magic (400× used)
22. shadow_tail (398× used)
23. crimson (394× used)
24. autumn_leaves (375× used)
25. digital_3d (362× used)
26. abstract_3d (335× used)
27. fire_tail (334× used)
28. elements (318× used)
29. ice_tail (287× used)
30. magic_tail (276× used)
31. magic_dust (212× used)
32. wish (208× used)
33. black_and_white (175× used)
34. stars (78× used)
35. speedy (76× used)
36. tech_path (60× used)
37. pollution (56× used)
38. red_dots (49× used)
39. tracks (45× used)
40. green_neon (44× used)
41. siren (43× used)
42. leaves (42× used)
43. feathers (41× used)
44. snowflakes (38× used)
45. propulsion (37× used)
46. treasure_map (37× used)
47. aaaaa (32× used)
48. festive_tree (29× used)
49. pumpkins (28× used)
50. zzzzz (28× used)
51. lunar_fireworks (23× used)
52. twinkles (22× used)
53. dots_inc (21× used)
54. bubbles (17× used)
55. blue_plasma (17× used)
56. bomb_fuse (15× used)
57. lucky_trail (14× used)
58. ghost (13× used)
59. money_trail (12× used)
60. rainbow_light (11× used)
61. red_plasma (8× used)
62. confetti (8× used)
63. rainbow_dots (8× used)
64. spacewar (6× used)
65. meteorite (4× used)
66. gold_dust (3× used)
67. gold (2× used)
68. musical_notes (1× used)