68 known values for trail with current usage counts:

1. default (28190× used)
2. fluff (10057× used)
3. yellow_dots (6101× used)
4. red (2857× used)
5. blue (1919× used)
6. paws (1564× used)
7. green (1505× used)
8. fire (1299× used)
9. rings (1293× used)
10. earth (1073× used)
11. ice (939× used)
12. arcade (924× used)
13. red_neon (841× used)
14. stardust (721× used)
15. flowers (631× used)
16. ice_dust (611× used)
17. blue_neon (573× used)
18. fire_dust (547× used)
19. sakura (528× used)
20. shadow_dust (513× used)
21. magic (405× used)
22. crimson (393× used)
23. autumn_leaves (380× used)
24. shadow_tail (370× used)
25. digital_3d (350× used)
26. fire_tail (325× used)
27. abstract_3d (315× used)
28. elements (295× used)
29. ice_tail (285× used)
30. magic_tail (261× used)
31. magic_dust (205× used)
32. wish (190× used)
33. black_and_white (123× used)
34. stars (74× used)
35. speedy (72× used)
36. tech_path (58× used)
37. pollution (50× used)
38. tracks (43× used)
39. leaves (43× used)
40. green_neon (42× used)
41. red_dots (41× used)
42. feathers (40× used)
43. snowflakes (36× used)
44. treasure_map (36× used)
45. siren (35× used)
46. propulsion (34× used)
47. zzzzz (30× used)
48. aaaaa (30× used)
49. pumpkins (29× used)
50. festive_tree (29× used)
51. twinkles (22× used)
52. lunar_fireworks (21× used)
53. dots_inc (21× used)
54. bubbles (16× used)
55. blue_plasma (11× used)
56. rainbow_light (11× used)
57. bomb_fuse (11× used)
58. lucky_trail (11× used)
59. rainbow_dots (10× used)
60. money_trail (10× used)
61. ghost (9× used)
62. red_plasma (7× used)
63. confetti (7× used)
64. spacewar (5× used)
65. meteorite (4× used)
66. gold_dust (3× used)
67. musical_notes (3× used)
68. gold (2× used)