68 known values for trail with current usage counts:

1. default (28342× used)
2. fluff (10385× used)
3. yellow_dots (6255× used)
4. red (2902× used)
5. blue (1952× used)
6. paws (1591× used)
7. green (1524× used)
8. fire (1297× used)
9. rings (1295× used)
10. earth (1074× used)
11. ice (941× used)
12. arcade (923× used)
13. red_neon (840× used)
14. stardust (721× used)
15. flowers (651× used)
16. ice_dust (618× used)
17. blue_neon (576× used)
18. fire_dust (550× used)
19. sakura (529× used)
20. shadow_dust (520× used)
21. magic (405× used)
22. crimson (394× used)
23. shadow_tail (379× used)
24. autumn_leaves (379× used)
25. digital_3d (356× used)
26. fire_tail (327× used)
27. abstract_3d (321× used)
28. elements (301× used)
29. ice_tail (287× used)
30. magic_tail (268× used)
31. magic_dust (208× used)
32. wish (191× used)
33. black_and_white (138× used)
34. stars (74× used)
35. speedy (72× used)
36. tech_path (59× used)
37. pollution (53× used)
38. red_dots (52× used)
39. tracks (44× used)
40. leaves (43× used)
41. green_neon (43× used)
42. siren (40× used)
43. feathers (40× used)
44. snowflakes (39× used)
45. treasure_map (37× used)
46. propulsion (35× used)
47. zzzzz (31× used)
48. aaaaa (30× used)
49. festive_tree (29× used)
50. pumpkins (29× used)
51. lunar_fireworks (24× used)
52. dots_inc (21× used)
53. twinkles (21× used)
54. bubbles (16× used)
55. rainbow_light (12× used)
56. bomb_fuse (11× used)
57. money_trail (11× used)
58. lucky_trail (11× used)
59. blue_plasma (11× used)
60. ghost (10× used)
61. rainbow_dots (9× used)
62. red_plasma (8× used)
63. confetti (7× used)
64. spacewar (5× used)
65. gold_dust (3× used)
66. meteorite (3× used)
67. gold (2× used)
68. musical_notes (1× used)