Para alterar as cores de fundo de pagina, texto, link´s use a tabela abaixo, pois ela contém os códigos de cores RGB em formato hexadecimal, o qual é utilizado na linguagem HTML.
Tabela de cores RGB em formato Hexadecimal aqui é só pegar e usar :P
white #FFFFFF = Branco
lime green #32cd32
red #FF0000
madarian orange #E47833
green #00FF00
maroon #8E2316
blue #0000FF
medium aquamarine #32CD99
magenta #FFOOFF
medium forest green #6888E23
cyan #OOFFFF
medium goldenrod #EAEAAE
yellow #FFFFOO
medium orchid #9370DB
black #000000
medium sea green #426F42
aquamarine #70DB93
medium slate blue #7F00FF
baker´s chocolate #5C3317
medium sprigmg green #7FFF00
blue violet #9F5F9F
medium turquoise #70DBDB
brass #85A642
medium violet red #DB7093
bright gold #D9D919
medium wood #A68064
brown #A62A2A
mednight blue #2F2F4F
bronze #8C7853
navy blue #23238E
bronze 11 #A67D3D
neon blue #4D4DFF
cadet blue #5F9F9F
neon pink #FF6EC7
cool copper #D98719
new midnight blue #00009C
copper #887333
new tan #EBC79E
coral #FF7F00
old gold #CFB53B
com flower blue #42426F
orange #FF7F00
dark brown #5C4033
orange red #FF2400
dark green #2F4F2F
orchid #DB70DB
dark green copper #4A766E
pale green #8FBC8F
dark olive green #4F4F2F
pink #BC8F8F
dark orchid #9932CD
plum #EAADEA
dark purple #871F78
quartz #D9D9F3
dark slate blue #6B238E
rich blue #5959AB
dark slate gray #2F4F4F
salmon #6F4242
dark tan #97694F
scarlet #8C1717
dark turquoise #7093DB
sea green #238E68
dark wood #855E42
semi-sweet chocolate #684226
dim grey #545454
sienna #8E6823
dusty rose #856363
silver #E6EBFA
feldspar #D19275
sky blue #3299CC
firebrick #8E2323
slate blue #007FFF
forest green #238E23
spicy pink #FF1CAE
gold #CD7F32
spring green #00FF7F
goldenrod #DBDB70
steel blue #23688E
grey #C0C0C0
summer sky #38B0DE
green copper #527F76
tan #DB9370
green yellow #93DB70
thistle DBBFDB
huntergreen #215E21
turquoise #ADEAEAE
indian red #4E2F2F
very dark brown #5C4033
khaki #9F9F5F
very light grey #CDCDCD
light blue #C0D9D9
violet #4F2F4F
light grey #A8A8A8
violet red #CC3299
light steel blue #BFBFBD
wheat #DBDBDF
light wood #E9C2A6
Não esquecer que quando inseridos num código HTML estes valores devem estar entre aspas. Exemplo:
<font color="#FF0000">Fonte em cor vermelha</font>