68 known values for trail with current usage counts:

1. default (27938× used)
2. fluff (9714× used)
3. yellow_dots (5968× used)
4. red (2773× used)
5. blue (1845× used)
6. paws (1493× used)
7. green (1472× used)
8. fire (1305× used)
9. rings (1304× used)
10. earth (1069× used)
11. ice (938× used)
12. arcade (926× used)
13. red_neon (836× used)
14. stardust (716× used)
15. flowers (586× used)
16. ice_dust (585× used)
17. blue_neon (571× used)
18. fire_dust (548× used)
19. sakura (525× used)
20. shadow_dust (476× used)
21. magic (393× used)
22. autumn_leaves (388× used)
23. crimson (386× used)
24. shadow_tail (339× used)
25. digital_3d (327× used)
26. fire_tail (307× used)
27. abstract_3d (275× used)
28. elements (274× used)
29. ice_tail (251× used)
30. magic_tail (240× used)
31. magic_dust (201× used)
32. wish (179× used)
33. black_and_white (82× used)
34. stars (72× used)
35. speedy (71× used)
36. tech_path (59× used)
37. pollution (52× used)
38. tracks (47× used)
39. leaves (42× used)
40. green_neon (40× used)
41. feathers (36× used)
42. siren (34× used)
43. red_dots (34× used)
44. snowflakes (31× used)
45. zzzzz (30× used)
46. treasure_map (30× used)
47. propulsion (29× used)
48. festive_tree (28× used)
49. pumpkins (28× used)
50. aaaaa (26× used)
51. twinkles (23× used)
52. dots_inc (21× used)
53. lunar_fireworks (19× used)
54. bubbles (14× used)
55. lucky_trail (11× used)
56. rainbow_light (11× used)
57. bomb_fuse (11× used)
58. rainbow_dots (9× used)
59. blue_plasma (9× used)
60. money_trail (8× used)
61. ghost (8× used)
62. confetti (8× used)
63. red_plasma (5× used)
64. spacewar (4× used)
65. meteorite (3× used)
66. musical_notes (2× used)
67. gold (2× used)
68. gold_dust (2× used)