Grout glitter or sparkle grout is now widely available to anybody who wishes to try simple tiling products at home.
Sites like http://www.staffordshiresilicones.com/ and http://www.groutglitter.com/ now offer products to the general public via mail order with a very quick turn around time (2/3days from order)

Products such as Grout glitter additive can be delivered anywhere in the UK for as little as £6.59 per 100g sachet in silver or gold that can be added straight into any grout mixture to produce stunning sparkle grout throughout your home. Grout Glitter

If you wish your glitter grout to be ready mixed and ready to use straight out of the tub then this is also available from only £19.99 with free UK delivery available in Black, Silver, Blue, Red and White all with silver sparkles in handy 1ltr tubs all fully flexible and waterproof with Anti-mould properties. Blue ready mixed glitter groutAtlas Glitter grout is the leading Glitter grout available on the market today In a mass  Show less