Cake Making experts help needed please

[Rosa]

I am making a cake for a milk allergic person . Thats not a problem but I need to decorate it. I am planning on using Royal Icing for the cake but then I am doing a handbag on top. I was going to use fondant icing ( I have only some ready to roll stuff as I can't get glucose here ) but I need to tint it beige and brown. I have the basic food colourings but not brown. Can I dissolve some cocoa in a bit of water and try to knead in or will it just go marbled on me ? DOes anybody have any suggestions ????. I will not get brown colouring in time now as I need it by next Tuesday and I get my stuff posted from the UK !
Thanks

Coffee?

in a bit of water will it work ???

make your own MArshmallow Fondant its yummy

16oz sml marshmallows
1-2 lbs icing sugar
3tbs water

Put marshmallows in large bowl put water over top
put in microwave for 2 mins stiring every 30secs
(When melted you can add 1 tbs of coco powder stir until dissolved)

Start adding icing sugar, when doesnt feel to sticky start needing using the rest of icing sugar leave to stand for a few hour or over night in cling film.

Roll out using a little bit of corn starch or tex

It really does taste yummy

Does sound good but I can only get pink and yellow marshmallows here the Haribo kind !!
When I have used them to make rice kripsie treats they do boil up very pink !!!!

Can you make brown by mixing the colours you have - yellow, red and blue should do it?

I will try that thanks Scooter I just don't have a lot spare to try out on either !!!

Could you make the handbag from white fondant then paint it with colouring of some kind? Might work.....