67 known values for trail with current usage counts:

1. default (28138× used)
2. fluff (9963× used)
3. yellow_dots (6068× used)
4. red (2839× used)
5. blue (1908× used)
6. paws (1537× used)
7. green (1500× used)
8. rings (1297× used)
9. fire (1297× used)
10. earth (1075× used)
11. ice (936× used)
12. arcade (923× used)
13. red_neon (838× used)
14. stardust (723× used)
15. flowers (632× used)
16. ice_dust (607× used)
17. blue_neon (572× used)
18. fire_dust (548× used)
19. sakura (527× used)
20. shadow_dust (502× used)
21. magic (403× used)
22. crimson (392× used)
23. autumn_leaves (382× used)
24. shadow_tail (361× used)
25. digital_3d (348× used)
26. fire_tail (321× used)
27. abstract_3d (317× used)
28. elements (295× used)
29. ice_tail (283× used)
30. magic_tail (258× used)
31. magic_dust (204× used)
32. wish (188× used)
33. black_and_white (107× used)
34. stars (73× used)
35. speedy (71× used)
36. tech_path (60× used)
37. pollution (50× used)
38. tracks (44× used)
39. red_dots (43× used)
40. leaves (43× used)
41. green_neon (42× used)
42. feathers (40× used)
43. siren (36× used)
44. propulsion (34× used)
45. snowflakes (33× used)
46. treasure_map (33× used)
47. zzzzz (31× used)
48. pumpkins (29× used)
49. festive_tree (29× used)
50. aaaaa (28× used)
51. twinkles (23× used)
52. dots_inc (23× used)
53. lunar_fireworks (20× used)
54. bubbles (17× used)
55. blue_plasma (11× used)
56. bomb_fuse (11× used)
57. lucky_trail (11× used)
58. rainbow_light (10× used)
59. rainbow_dots (10× used)
60. ghost (9× used)
61. confetti (7× used)
62. money_trail (7× used)
63. spacewar (6× used)
64. red_plasma (5× used)
65. meteorite (3× used)
66. gold_dust (3× used)
67. gold (2× used)