Original topic by Admshumaker. I have permission from sentinels to repost this.
Also changed some formatting and such. Thanks to Adm and Tummnus for their work.
Thanks to Evilsantah for helping me out with colours I'm missing!

Chat box:
#CB546B : errors - This tribe name is already taken, please choose another.
#6C77C1: default info/quote text - Admshumaker is now your shaman, follow her!
#BABD2F: special info - Admshumaker had just unlocked the «Cheeeeeese *-*» title.
#C2C2DA: normal text - [Admshumaker] Hello.
#606090 : offline friends - Admshumaker - disconnected
#009D9D: names, misc - [Admshumaker]
#ED67EA : mod messages, misc - • [SERVER] The server will restart in 2 minutes.
#98E2EB : blue shaman - Admshumaker is now your shaman, follow her!
#EDCC8D: outgoing whispers < [Evilsantah] hi qt
#f0a78e/#e68d43: Incoming whispers > [Evilsantah] hi qt
#30BA76/#92CF91: tribe chat • [Admshumaker] Hello.
#98E2EB: blue shaman [Shaman Admshumaker] Hello.
#FEB1FC: pink shaman [Shaman Admshumaker] Hello.
#29894C: Friended user in your room.

Grounds:
#D4B699/#A27C5B: Wood
#CADDE7/#88B5CC: Ice
#624181/#40235B/#926CB4: Trampoline
#B32B01/#F59605/#FAD100: Lava
#AA8262/#6A3313: Chocolate
#ECF3F5/#658010/#301A0C/#AF773D/#684422: Ground + grass + snow
#EFDF79/#EACA54/#BB9428: Sand
#6DA7AF: Water
#B7B2A3/#5E584B: Stone
#324650: Default square/circle color

Backgrounds:
#6A7495: Default
#60A9D4/#79B5D7/#88BCD8/#B3CFDD/#A4D0E7: Daylight
#A985AB/#615179/#8D7097/#CB9EBA/#DAADAF/#FFF494: Dawn
#B6491F/#CD7127/#E09844/#FFEC95: Twilight
#10193F/#1A2846/#4A576F/#E6FFFF: Full moon
#414C52/#212C33/#C9CACB/#5C676D: Halloween
#F9DE99/#EEF0E2/#516C5D: Christmas
#93759C/#C89BBC/#DAADAF/#F1C296/#FFFF94/#D397C0/#C0955B/#D01130: Valentines Day
#465864/#7B8A93: Storm clouds
#13191E/#444C50/#3F474B/#788186: Storm clouds 2

Shaman Items:
#922C92/#5D1E5D Arrow
#FFFFFF/#A0AAB4/#CBD1D6: Spirit
#95D9D6/#77ADAA/#537977: Totem Feather
#31AFF1/#61C7FF/#1273AA: Balloon on the shaman item list
#00FFFF/#909CA8: Rune
#AC7F56/#D29E6C/#946A46/#553617/#40260D/#4D3620/#855F3B/#895B2F/#C89563/#9E7045: Small Box
#AC7F56/#D29E6C/#946A46/#553617/#40260D/#4D3620/#855F3B/#895B2F/#C89563/#9E7045: Big Box
#202020/#0D0D0D/#181818/#464D59/#666E80: Anvil
#B58253/#8F5F35/#885F3B: Little board
#B58253/#8F5F35/#885F3B: Big Board
#F4CD3A/#CF6A27/#FEDE5F/#EDBFA3/#894319/#A98612 Ball
#999999/#393939/#0A0A0A/#111111: Cannon
#171757: Blue portal
#9B4606: Orange portal
#307B66/#9BADB8: Trampoline (shaman)

Defilante icons:
#F0C251: Ring
#434747: Spring
#63CEE7: Lightning bolt
#8FE030: +1

Default furniture colors:
#8A311B: Sofa, padded chair, curtains
#46788E/#E0D7CE/#8D643B/#734E28: Bed
#8D643B/#734E28/#DEA5D8/#475416/#549A97/#38230F: Wardrobe
#57703E/#E7C3D6: Flowers
#48230C/#43581B/#43581B/#82877A(/#55BDB8/#CB7D99): Plant. The parenthesis is the eggs that hide in it.
#AF6C1A/#E7DCCE: Chicken
#D0933B: Bottle
#8CA64D/#ACACAC/#E298C0: Small plant

Minimalism ground colors:
#324650: Grass/earth
#9BAABC: Ghost
#89A7F5: Ice
#D84801: Lava
#6D4E94: Tramp

Miscellaneous other colors:
#95D9D6: blue
#FF99FF: pink
#FADE55: gold
#0E242D: forum background
#1C3C41: forum background²
#3C5064 buttons
#E3B55A/#FED69A: Cheese
#111111/#2B1D14/#271912: Hole
#18243A: Forum Sticky Thread
#8F4645: Mouse on watch
#6F6971: Mouse that is not on watch but the watch command is in effect
#009D9D: Non staff member's color on the forums
#EB1D51: Admin's username color on the forums
#2ECF73: Sentinel's username color on the forums
#BABD2F: Moderator's/Modsent's name color
#F4FA32: Title
#2F7FCC: Map crew name
#B590F0: Sentinel aide (old forums)
#F9BDA4: Supermoderator (old forums)


COLORS AND FURS

Colors:
#78583A: Default
#E3C07E: Ear color for all colors and some furs
#BD9067: 1st
#593618: 2nd
#8C887F: 3rd
#DED7CE: 4th
#4E443A: 5th
#E3C07E: 6th
#272220: 7th

Furs:
#CDC6C2/#63431A: 1st
#CDC6C2/#391F0E: 2nd
#7C8788/#EFE7DA: 3rd
#EFEBE0/#342E22/#A47C4B: 4th
#7F5A32/#EEE7DD: 5th
#262626/#989593: 6th
#BF7517/#DDD2C8/#332F29: 7th
#B44F0D/#3A1F11/#EFE7DA: 8th
#A29079/#303030/#E4D7C6: 9th
#99532B/#281F1A/#D0C4C4: 10th
#8E8273/#4C433E/#EFE5D5/A48865: 11th
#F5F8F9/#DEE7EA/#67878F: 12th
#9D3F0C/#EFE7DA/#311E12: 13th
#EFEBE0/#342D23: 14th
#EFEBE0/#514134/#342D23: 15th
#F9E9A1/#D28034/#3C0F00[/quote]: 16th
#D7D9D6/#97948D/#535760/#393834: 17th
#231200/#562C19/#7C4024/#C6AE9D/#EEDBCC: 18th
#3EAED7/#EFE7DA/#E0B583/#C27218/#342C1F: 19th

Any additional colours or new colours, please feel free to post them here.