A Java Rangoli...

[pinch_hitter]

import java.util.*;
public class Pascal{
        public static void main(String[] args){
                int n = Integer.parseInt(args[0]);
                char[] ch =new char[10];
                for(int i=0;i<10;i++)
                        ch[i] = ' ';
                int count = 0;
                Random rand = new Random();
                while(count                        int ind = rand.nextInt();
                        ind = Math.abs(ind);
                        int num = ind % 10;
                        char pch = ch[num];
                        if(ind % 5 == 0 && ch[num] ==  ' ')
                                ch[num] =  '*';
                        else if(ind % 4 == 0 && ch[num] ==  ' ')
                                ch[num] =  '^';
                        else if(ind % 3 == 0 && ch[num] ==  ' ')
                                ch[num] =  '+';
                        else if(ind % 2 == 0 && ch[num] ==  ' ')
                                ch[num] =  '!';
                        else if(ind % 1 == 0 && ch[num] ==  ' ')
                                ch[num] =  '!';
                        if(ch[num] != ' '&& pch == ' ')
                                count++;
                }
                for(int i=0;i                        String out="";
                        for(int k=0;k<(n-i);k++)
                                out+= " ";
                        for(int j=0; j < (i+1); j++){
                                Float f = new Float((fac(i)/(fac(j)*fac(i-j)))+"");
                                int nn  = f.intValue()%10;
                                out += ch[nn]+" ";
                        }
                        System.out.println(out);
                }
                for(int i=n-1;i>=0;i--){

String out="";
                        for(int k=0;k<(n-i);k++)
                                out+= " ";
                                                for(int j=0; j < (i+1); j++){
                                Float f = new Float((fac(i)/(fac(j)*fac(i-j)))+"");
                                int nn  = f.intValue()%10;
                                out += ch[nn]+" ";
                        }
                        System.out.println(out);
                }
        }
        static float fac(int n){
                float f=1;
                for(int i=1;i<=n;i++)
                        f*=i;
        return f;
        }
}

Uses:
java Pascal

e.g. java Pascal 15 5
e.g. java Pascal 20 4
e.g. java Pascal 25 6

*first parameter is the size
*2nd parameter is the random factor should be less then 9

Run this program multipal times  and see different Rangoli. try with different parameter(s).