153 known values for skin with current usage counts:

1. default (21654× used)
2. red (16380× used)
3. green (10993× used)
4. follower (3991× used)
5. clown (1139× used)
6. trapper (945× used)
7. vampire (858× used)
8. lab_apprentice (798× used)
9. helmet_banana (557× used)
10. snowman (556× used)
11. og_white (471× used)
12. anniversary (448× used)
13. rural_fella (414× used)
14. cool_cap (413× used)
15. party_hat (393× used)
16. daisy (391× used)
17. gingerbread (306× used)
18. panda (233× used)
19. gift_box (224× used)
20. pumpkin (214× used)
21. monk (205× used)
22. black_dog (190× used)
23. og_purple (183× used)
24. dog (166× used)
25. builder (160× used)
26. anniversary_2 (158× used)
27. edm (153× used)
28. toaster (136× used)
29. demon (127× used)
30. tea_cup (120× used)
31. og_yellow (115× used)
32. og_pink (107× used)
33. cyborg_3 (101× used)
34. cyborg_1 (91× used)
35. reindeer (89× used)
36. elf (88× used)
37. grim_reaper (84× used)
38. green_spikes (84× used)
39. bad_cap (77× used)
40. detective (70× used)
41. wizard (66× used)
42. cubix (62× used)
43. evil_bot (61× used)
44. king (59× used)
45. grey_cat (58× used)
46. joker (58× used)
47. sushi (55× used)
48. mummy (54× used)
49. mad_scientist (51× used)
50. cat (51× used)
51. headset (50× used)
52. spikes (49× used)
53. peach (49× used)
54. narwhal (48× used)
55. orca (47× used)
56. yeti (47× used)
57. security_bot (44× used)
58. rplace (41× used)
59. parrot (38× used)
60. fries (38× used)
61. siren (37× used)
62. shades (37× used)
63. lunar_dragon (36× used)
64. ninja (33× used)
65. wolf (33× used)
66. angel (33× used)
67. anniversary_3 (32× used)
68. murica (32× used)
69. white_demon (31× used)
70. country_nl (30× used)
71. ghost (30× used)
72. top_hat (28× used)
73. astronaut (27× used)
74. eliminated (27× used)
75. cyborg_2 (27× used)
76. shark_attack (25× used)
77. bow_tie (24× used)
78. festive_lights (22× used)
79. devil (20× used)
80. treasure_chest (20× used)
81. country_us (19× used)
82. apple (19× used)
83. alien (19× used)
84. rabbit (18× used)
85. bee_costume (16× used)
86. curious_bot (15× used)
87. bunny_costume (15× used)
88. scuba_diver (15× used)
89. bandit (15× used)
90. country_fr (15× used)
91. tiger (15× used)
92. country_de (14× used)
93. whale (14× used)
94. ramen (14× used)
95. blue_dinosaur (13× used)
96. country_il (13× used)
97. country_gb (13× used)
98. leprechaun (13× used)
99. pirate (12× used)
100. country_se (12× used)
101. country_be (11× used)
102. carrot_costume (11× used)
103. block (10× used)
104. country_pl (10× used)
105. monkey (10× used)
106. mark (10× used)
107. dinosaur (10× used)
108. country_au (10× used)
109. cow (9× used)
110. boby (9× used)
111. country_fi (9× used)
112. pineapple (8× used)
113. country_no (8× used)
114. country_it (8× used)
115. country_cz (8× used)
116. red_cocoa (8× used)
117. spy (7× used)
118. country_ro (7× used)
119. shape (7× used)
120. science_adept (7× used)
121. fairy (7× used)
122. steampunk (6× used)
123. country_gr (6× used)
124. country_es (6× used)
125. unicorn (6× used)
126. icefox (6× used)
127. burger (5× used)
128. polar_bear (5× used)
129. nutcracker (5× used)
130. firefighter (5× used)
131. country_ca (5× used)
132. hamster (4× used)
133. country_si (4× used)
134. green_cocoa (4× used)
135. country_ru (4× used)
136. country_hu (4× used)
137. alice (4× used)
138. country_ch (4× used)
139. popcorn (3× used)
140. banana (3× used)
141. fossil (3× used)
142. country_hr (3× used)
143. firefox (3× used)
144. mecha (3× used)
145. graffiti (2× used)
146. black_crown (2× used)
147. white_crown (2× used)
148. burglar (2× used)
149. stinger (1× used)
150. pig (1× used)
151. yellow_crown (1× used)
152. alfie (1× used)
153. cardboard_box (1× used)