68 known values for trail with current usage counts:

1. default (28862× used)
2. fluff (11313× used)
3. yellow_dots (6633× used)
4. red (3052× used)
5. blue (2047× used)
6. paws (1702× used)
7. green (1602× used)
8. fire (1306× used)
9. rings (1293× used)
10. earth (1080× used)
11. ice (940× used)
12. arcade (922× used)
13. red_neon (849× used)
14. stardust (717× used)
15. flowers (668× used)
16. ice_dust (648× used)
17. blue_neon (572× used)
18. fire_dust (562× used)
19. shadow_dust (554× used)
20. sakura (534× used)
21. shadow_tail (422× used)
22. magic (407× used)
23. crimson (393× used)
24. autumn_leaves (371× used)
25. digital_3d (367× used)
26. fire_tail (349× used)
27. abstract_3d (344× used)
28. elements (333× used)
29. ice_tail (303× used)
30. magic_tail (285× used)
31. magic_dust (215× used)
32. wish (213× used)
33. black_and_white (212× used)
34. stars (80× used)
35. speedy (75× used)
36. pollution (68× used)
37. red_dots (65× used)
38. tech_path (59× used)
39. tracks (50× used)
40. siren (47× used)
41. green_neon (45× used)
42. propulsion (43× used)
43. feathers (43× used)
44. leaves (42× used)
45. snowflakes (41× used)
46. treasure_map (38× used)
47. aaaaa (33× used)
48. pumpkins (28× used)
49. festive_tree (28× used)
50. twinkles (26× used)
51. zzzzz (26× used)
52. blue_plasma (24× used)
53. ghost (24× used)
54. lunar_fireworks (22× used)
55. dots_inc (21× used)
56. bubbles (19× used)
57. bomb_fuse (17× used)
58. money_trail (15× used)
59. rainbow_light (14× used)
60. red_plasma (14× used)
61. spacewar (13× used)
62. lucky_trail (13× used)
63. gold (12× used)
64. confetti (11× used)
65. rainbow_dots (10× used)
66. meteorite (6× used)
67. musical_notes (4× used)
68. gold_dust (2× used)