How can we design a random mosaic tiles for the kitchen wall?

The site is located between the plate and cover – As a feature. Nine different color tiles to fit in this "poll" of the model. How can I get a result looks good. Is there a formula?

Just placed randomly. Just try on the counter before hand to find a model you like.

How to Make Tile Mosaics & Patterns : How to Create a Tile Quilt Mosaic

Mosaic Sandstone Coasters Only or with Holder …

Joster Coasterica 2-in-1 Mosaic Silicone Stemware Coaster and Glass Marker, Set of 4 $12.00 Wine Glass Charms and Unique Beverage Coasters All In One. Protects surfaces and your stemware from room to room. Put these on before your guests arrive and never remind them to use a coaster again. An “inside” job: Glassware fits inside these unique beverage Coasters. One Size fits all: These durable, flexible drink coasters stretch to fit most stemware. They slip on and stay on. Protect precious…

Thirstystone ‘Contemporary Mosaic’ Sandstone Drink Coaster Set with a Walnut Holder Included $27.00 Thirstystone’s Contemporary Mosaic Sandstone Coasters are designed to mesh with most interiors. The Artwork on this drink coaster set is actually 2 portions of two different artworks combined to make one brilliant Mosaic. Enjoy your Thirstystone Natural and Eco Friendly Drink Coasters for years to come!…

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Spanish Piano Music, Vol. 1: Granados, Albéniz $21.99 …