Now with random seed.

Cargo.lock

@@ -3,6 +3,7 @@ name = "loldog"
 version = "0.1.0"
 dependencies = [
  "ansi_term 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -10,3 +11,16 @@ name = "ansi_term"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "libc"
+version = "0.2.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "rand"
+version = "0.3.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+

Cargo.toml

@@ -4,4 +4,5 @@ version = "0.1.0"
 authors = ["logaritmisk <anders.e.olsson@gmail.com>"]
 
 [dependencies]
+rand = "0.3"
 ansi_term = "0.9"

src/main.rs

@@ -1,19 +1,23 @@
+extern crate rand;
 extern crate ansi_term;
 
 use std::io;
 use std::io::prelude::*;
 use std::f32::consts::PI;
 
+use rand::{thread_rng, Rng};
 use ansi_term::Colour::RGB;
 
 fn main() {
+    let r = thread_rng().gen_range(0, 256);
+
     let stdin = io::stdin();
 
     for (n, line) in stdin.lock().lines().enumerate() {
         let line = line.unwrap();
 
         for (o, c) in line.chars().enumerate() {
-            let (red, green, blue) = rainbow(0.1, n + o);
+            let (red, green, blue) = rainbow(0.1, r + n + o);
 
             print!("{}", RGB(red, green, blue).paint(c.to_string()));
         }