68 known values for trail with current usage counts:

1. default (28588× used)
2. fluff (10872× used)
3. yellow_dots (6443× used)
4. red (2988× used)
5. blue (2002× used)
6. paws (1665× used)
7. green (1572× used)
8. fire (1301× used)
9. rings (1295× used)
10. earth (1083× used)
11. ice (938× used)
12. arcade (920× used)
13. red_neon (845× used)
14. stardust (720× used)
15. flowers (655× used)
16. ice_dust (628× used)
17. blue_neon (572× used)
18. fire_dust (555× used)
19. sakura (533× used)
20. shadow_dust (528× used)
21. magic (401× used)
22. shadow_tail (400× used)
23. crimson (395× used)
24. autumn_leaves (375× used)
25. digital_3d (363× used)
26. fire_tail (334× used)
27. abstract_3d (332× used)
28. elements (317× used)
29. ice_tail (290× used)
30. magic_tail (280× used)
31. magic_dust (213× used)
32. wish (208× used)
33. black_and_white (173× used)
34. stars (78× used)
35. speedy (75× used)
36. tech_path (60× used)
37. pollution (59× used)
38. red_dots (51× used)
39. tracks (46× used)
40. green_neon (44× used)
41. siren (41× used)
42. leaves (41× used)
43. feathers (41× used)
44. snowflakes (38× used)
45. treasure_map (37× used)
46. propulsion (37× used)
47. aaaaa (32× 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 (20× used)
54. blue_plasma (19× used)
55. bubbles (17× used)
56. bomb_fuse (16× used)
57. lucky_trail (14× used)
58. rainbow_light (13× used)
59. ghost (13× used)
60. money_trail (12× used)
61. rainbow_dots (9× used)
62. red_plasma (9× used)
63. confetti (8× used)
64. spacewar (7× used)
65. meteorite (4× used)
66. gold (2× used)
67. gold_dust (2× used)
68. musical_notes (1× used)