Can anyone tell me where I can buy coloured artificial bear grass, I've seen it on other peoples cakes in blues and pinks and reds and all sorts of colours but I can not find a supplier. Can anyone help? 
I just found perhaps a bear grass substitute: flat florist wire in colors:
http://www.wedding-flowers-and-reception-ideas.com/oasis-flat-wire.html
In fact that site has many wires and other things that you could use on cakes. Of course, they need to be put in a coffee stirrer or straw to protect the cake.
AWESOME shanter !! That flat wire looks like a great decor addition for cakes.. LOVE IT !! 
I found the Bear Grass at my local Michaels Arts and Crafts store =)
waiting for it to be shipped from the UK was not an option for me since the cake was do ASAP!
And to color the Bear Grass I used DESIGN MASTER spray paint , Also found at Michaels 
So HAPPY I FOUND IT LOCALLY..
Here's the cake & Bear Grass
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