The 216 Web-Safe Colors:

#000000 #330000 #660000 #990000 #CC0000 #FF0000
#003300 #333300 #663300 #993300 #CC3300 #FF3300
#006600 #336600 #666600 #996600 #CC6600 #FF6600
#009900 #339900 #669900 #999900 #CC9900 #FF9900
#00CC00 #33CC00 #66CC00 #99CC00 #CCCC00 #FFCC00
#00FF00 #33FF00 #66FF00 #99FF00 #CCFF00 #FFFF00
#000033 #330033 #660033 #990033 #CC0033 #FF0033
#003333 #333333 #663333 #993333 #CC3333 #FF3333
#006633 #336633 #666633 #996633 #CC6633 #FF6633
#009933 #339933 #669933 #999933 #CC9933 #FF9933
#00CC33 #33CC33 #66CC33 #99CC33 #CCCC33 #FFCC33
#00FF33 #33FF33 #66FF33 #99FF33 #CCFF33 #FFFF33
#000066 #330066 #660066 #990066 #CC0066 #FF0066
#003366 #333366 #663366 #993366 #CC3366 #FF3366
#006666 #336666 #666666 #996666 #CC6666 #FF6666
#009966 #339966 #669966 #999966 #CC9966 #FF9966
#00CC66 #33CC66 #66CC66 #99CC66 #CCCC66 #FFCC66
#00FF66 #33FF66 #66FF66 #99FF66 #CCFF66 #FFFF66
#000099 #330099 #660099 #990099 #CC0099 #FF0099
#003399 #333399 #663399 #993399 #CC3399 #FF3399
#006699 #336699 #666699 #996699 #CC6699 #FF6699
#009999 #339999 #669999 #999999 #CC9999 #FF9999
#00CC99 #33CC99 #66CC99 #99CC99 #CCCC99 #FFCC99
#00FF99 #33FF99 #66FF99 #99FF99 #CCFF99 #FFFF99
#0000CC #3300CC #6600CC #9900CC #CC00CC #FF00CC
#0033CC #3333CC #6633CC #9933CC #CC33CC #FF33CC
#0066CC #3366CC #6666CC #9966CC #CC66CC #FF66CC
#0099CC #3399CC #6699CC #9999CC #CC99CC #FF99CC
#00CCCC #33CCCC #66CCCC #99CCCC #CCCCCC #FFCCCC
#00FFCC #33FFCC #66FFCC #99FFCC #CCFFCC #FFFFCC
#0000FF #3300FF #6600FF #9900FF #CC00FF #FF00FF
#0033FF #3333FF #6633FF #9933FF #CC33FF #FF33FF
#0066FF #3366FF #6666FF #9966FF #CC66FF #FF66FF
#0099FF #3399FF #6699FF #9999FF #CC99FF #FF99FF
#00CCFF #33CCFF #66CCFF #99CCFF #CCCCFF #FFCCFF
#00FFFF #33FFFF #66FFFF #99FFFF #CCFFFF #FFFFFF