In graphics mode, you can specify a color by name, as in: setcolor(RED) or setcolor (GREEN), but there are actually 64 colors which you can use. Most of them don't have a corresponding name. Just use the number, like setcolor(43) or setcolor(12). Here's a picture of the available colors:

By the way, here's the code that made the above code:
//
// Project Name: All the Colors
//
// Author: Matthew Weathers
// Date : 10-Sept-2001
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include <string.h>
#include "graphics2.h"
#define ESC 0x1b
void main()
{
srand(time(NULL)); // Seed the random number generator
int GraphDriver=0,GraphMode=0;
initgraph( &GraphDriver, &GraphMode, "", 640, 480 ); // Start Window
char tempstring[80];
int i,j,color;
for(i=0;i<=7;i++) {
for (j=0;j<=8;j++) {
color =i*8+j;
setcolor(color);
setfillstyle(SOLID_FILL,color);
sprintf(tempstring,"%d",color);
bar (50+40*i,50+40*j, 80+40*i, 80+40*j);
setcolor(WHITE);
outtextxy(50+40*i,50+40*j,tempstring);
}
}
getch(); //Wait for a key. (When main function ends, the window will close)
} //end of main()