154 known values for skin with current usage counts:

1. default (21978× used)
2. red (16605× used)
3. green (11115× used)
4. follower (4169× used)
5. clown (1152× used)
6. trapper (999× used)
7. vampire (870× used)
8. lab_apprentice (801× used)
9. snowman (553× used)
10. helmet_banana (553× used)
11. cool_cap (551× used)
12. daisy (473× used)
13. og_white (473× used)
14. anniversary (454× used)
15. rural_fella (412× used)
16. party_hat (391× used)
17. gingerbread (306× used)
18. panda (228× used)
19. gift_box (222× used)
20. monk (215× used)
21. pumpkin (212× used)
22. black_dog (191× used)
23. og_purple (183× used)
24. dog (166× used)
25. anniversary_2 (162× used)
26. builder (160× used)
27. edm (157× used)
28. toaster (139× used)
29. demon (132× used)
30. tea_cup (123× used)
31. og_yellow (118× used)
32. cyborg_3 (110× used)
33. og_pink (109× used)
34. cyborg_1 (90× used)
35. green_spikes (90× used)
36. grim_reaper (89× used)
37. reindeer (88× used)
38. elf (85× used)
39. bad_cap (82× used)
40. detective (75× used)
41. wizard (67× used)
42. evil_bot (65× used)
43. joker (64× used)
44. cubix (63× used)
45. king (62× used)
46. narwhal (61× used)
47. mad_scientist (60× used)
48. grey_cat (60× used)
49. sushi (58× used)
50. orca (56× used)
51. cat (51× used)
52. yeti (51× used)
53. mummy (50× used)
54. spikes (50× used)
55. headset (50× used)
56. peach (48× used)
57. security_bot (43× used)
58. parrot (43× used)
59. anniversary_3 (41× used)
60. rplace (41× used)
61. fries (41× used)
62. eliminated (40× used)
63. white_demon (38× used)
64. angel (36× used)
65. siren (36× used)
66. shades (36× used)
67. lunar_dragon (35× used)
68. wolf (35× used)
69. ninja (34× used)
70. murica (34× used)
71. bow_tie (31× used)
72. country_nl (30× used)
73. top_hat (29× used)
74. cyborg_2 (29× used)
75. devil (28× used)
76. astronaut (27× used)
77. ghost (27× used)
78. shark_attack (26× used)
79. alien (25× used)
80. festive_lights (21× used)
81. ramen (20× used)
82. bee_costume (20× used)
83. treasure_chest (20× used)
84. country_us (19× used)
85. whale (19× used)
86. rabbit (18× used)
87. icefox (18× used)
88. apple (17× used)
89. monkey (17× used)
90. country_de (17× used)
91. block (17× used)
92. tiger (16× used)
93. bunny_costume (16× used)
94. blue_dinosaur (16× used)
95. scuba_diver (15× used)
96. curious_bot (15× used)
97. country_fr (14× used)
98. cow (14× used)
99. bandit (14× used)
100. boby (13× used)
101. country_se (13× used)
102. leprechaun (12× used)
103. shape (12× used)
104. science_adept (12× used)
105. pirate (12× used)
106. country_pl (12× used)
107. firefox (11× used)
108. country_gb (11× used)
109. country_au (11× used)
110. carrot_costume (11× used)
111. burger (11× used)
112. country_il (11× used)
113. steampunk (10× used)
114. spy (10× used)
115. dinosaur (10× used)
116. country_fi (9× used)
117. mecha (9× used)
118. country_be (9× used)
119. fairy (8× used)
120. mark (8× used)
121. burglar (8× used)
122. banana (8× used)
123. country_cz (7× used)
124. polar_bear (7× used)
125. graffiti (7× used)
126. country_ro (7× used)
127. country_no (7× used)
128. country_gr (6× used)
129. country_es (6× used)
130. red_cocoa (6× used)
131. hamster (6× used)
132. country_it (6× used)
133. unicorn (6× used)
134. nutcracker (6× used)
135. country_ca (5× used)
136. pig (5× used)
137. firefighter (4× used)
138. alice (4× used)
139. country_ch (4× used)
140. jailbreak (4× used)
141. green_cocoa (4× used)
142. country_ru (4× used)
143. fossil (4× used)
144. country_hu (4× used)
145. country_hr (3× used)
146. cardboard_box (3× used)
147. popcorn (3× used)
148. country_si (3× used)
149. pineapple (2× used)
150. yellow_crown (2× used)
151. blue_crown (2× used)
152. black_crown (2× used)
153. stinger (1× used)
154. laurel (1× used)