68 known values for trail with current usage counts:

1. default (27959× used)
2. fluff (9756× used)
3. yellow_dots (5986× used)
4. red (2786× used)
5. blue (1855× used)
6. paws (1508× used)
7. green (1476× used)
8. rings (1302× used)
9. fire (1301× used)
10. earth (1067× used)
11. ice (937× used)
12. arcade (925× used)
13. red_neon (836× used)
14. stardust (717× used)
15. ice_dust (588× used)
16. flowers (587× used)
17. blue_neon (573× used)
18. fire_dust (548× used)
19. sakura (522× used)
20. shadow_dust (478× used)
21. magic (395× used)
22. autumn_leaves (388× used)
23. crimson (387× used)
24. shadow_tail (344× used)
25. digital_3d (330× used)
26. fire_tail (308× used)
27. abstract_3d (286× used)
28. elements (278× used)
29. ice_tail (258× used)
30. magic_tail (245× used)
31. magic_dust (202× used)
32. wish (182× used)
33. black_and_white (80× used)
34. stars (73× used)
35. speedy (69× used)
36. tech_path (56× used)
37. pollution (53× used)
38. tracks (48× used)
39. leaves (42× used)
40. green_neon (41× used)
41. feathers (35× used)
42. siren (34× used)
43. snowflakes (33× used)
44. red_dots (33× used)
45. treasure_map (31× used)
46. zzzzz (31× used)
47. propulsion (29× used)
48. festive_tree (28× used)
49. pumpkins (28× used)
50. twinkles (25× used)
51. aaaaa (25× used)
52. lunar_fireworks (21× used)
53. dots_inc (20× used)
54. bubbles (15× used)
55. bomb_fuse (12× used)
56. rainbow_light (11× used)
57. lucky_trail (11× used)
58. blue_plasma (9× used)
59. ghost (9× used)
60. rainbow_dots (9× used)
61. money_trail (8× used)
62. confetti (8× used)
63. spacewar (5× used)
64. red_plasma (5× used)
65. meteorite (3× used)
66. gold_dust (2× used)
67. gold (2× used)
68. musical_notes (2× used)