68 known values for trail with current usage counts:

1. default (28451× used)
2. fluff (10616× used)
3. yellow_dots (6351× used)
4. red (2941× used)
5. blue (1973× used)
6. paws (1617× used)
7. green (1550× used)
8. fire (1301× used)
9. rings (1296× used)
10. earth (1076× used)
11. ice (943× used)
12. arcade (920× used)
13. red_neon (844× used)
14. stardust (719× used)
15. flowers (649× used)
16. ice_dust (623× used)
17. blue_neon (577× used)
18. fire_dust (553× used)
19. sakura (530× used)
20. shadow_dust (524× used)
21. magic (404× used)
22. crimson (396× used)
23. shadow_tail (386× used)
24. autumn_leaves (378× used)
25. digital_3d (357× used)
26. fire_tail (329× used)
27. abstract_3d (326× used)
28. elements (310× used)
29. ice_tail (290× used)
30. magic_tail (269× used)
31. magic_dust (209× used)
32. wish (201× used)
33. black_and_white (158× used)
34. stars (76× used)
35. speedy (75× used)
36. tech_path (59× used)
37. pollution (54× used)
38. red_dots (52× used)
39. tracks (44× used)
40. siren (43× used)
41. leaves (43× used)
42. green_neon (41× used)
43. feathers (40× used)
44. snowflakes (38× used)
45. treasure_map (37× used)
46. propulsion (37× used)
47. zzzzz (31× used)
48. aaaaa (31× used)
49. festive_tree (29× used)
50. pumpkins (29× used)
51. lunar_fireworks (23× used)
52. dots_inc (22× used)
53. twinkles (21× used)
54. bubbles (17× used)
55. bomb_fuse (15× used)
56. lucky_trail (14× used)
57. blue_plasma (11× used)
58. ghost (11× used)
59. rainbow_light (11× used)
60. money_trail (10× used)
61. red_plasma (9× used)
62. rainbow_dots (9× used)
63. confetti (8× used)
64. spacewar (5× used)
65. meteorite (3× used)
66. gold_dust (3× used)
67. gold (2× used)
68. musical_notes (1× used)