68 known values for trail with current usage counts:

1. default (28767× used)
2. fluff (11188× used)
3. yellow_dots (6558× used)
4. red (3038× used)
5. blue (2041× used)
6. paws (1702× used)
7. green (1591× used)
8. fire (1308× used)
9. rings (1296× used)
10. earth (1079× used)
11. ice (937× used)
12. arcade (923× used)
13. red_neon (849× used)
14. stardust (723× used)
15. flowers (662× used)
16. ice_dust (644× used)
17. blue_neon (572× used)
18. fire_dust (562× used)
19. shadow_dust (551× used)
20. sakura (533× used)
21. shadow_tail (419× used)
22. magic (408× used)
23. crimson (391× used)
24. autumn_leaves (372× used)
25. digital_3d (365× used)
26. fire_tail (347× used)
27. abstract_3d (340× used)
28. elements (329× used)
29. ice_tail (293× used)
30. magic_tail (285× used)
31. wish (212× used)
32. magic_dust (212× used)
33. black_and_white (193× used)
34. stars (77× used)
35. speedy (76× used)
36. red_dots (64× used)
37. pollution (63× used)
38. tech_path (59× used)
39. tracks (49× used)
40. siren (48× used)
41. green_neon (44× used)
42. leaves (42× used)
43. propulsion (42× used)
44. feathers (42× used)
45. snowflakes (40× used)
46. treasure_map (38× used)
47. aaaaa (33× used)
48. zzzzz (29× used)
49. festive_tree (28× used)
50. pumpkins (28× used)
51. blue_plasma (23× used)
52. twinkles (23× used)
53. ghost (22× used)
54. lunar_fireworks (22× used)
55. dots_inc (21× used)
56. bubbles (19× used)
57. bomb_fuse (16× used)
58. money_trail (15× used)
59. rainbow_light (14× used)
60. lucky_trail (13× used)
61. red_plasma (13× used)
62. gold (13× used)
63. spacewar (12× used)
64. rainbow_dots (10× used)
65. confetti (9× used)
66. meteorite (6× used)
67. musical_notes (3× used)
68. gold_dust (2× used)