Here's one that I tried recently.
http://www.cakecentral.com/cake_recipes_rate-2224-4.html
HTH.
Hi and Welcome, ritapardo. 
Here's a list of CC acronyms:
http://forum.cakecentral.com/cake-decorating-ftopict-2926-.html
Haven't tried fooby's recommendation, but it looks luscious.
For very simple to make chocolate b/c:
(That tastes great!)
http://www.cakecentral.com/cake_recipe-2033-Chocolate-Syrup-Frosting.html
Or if you feel very creative, Toba Garrett's chocolate b/c:
(Made with chocolate ganache.)
http://tinyurl.com/3y79vf
Everything you ever wanted to know about ganache:
(Overview, recipes, how to glaze and more.)
http://forum.cakecentral.com/cake-decorating-ftopict-334973-.html
HTH
I use my regular 1/2 butter 1/2 crisco recipe, but add 4 squares of bakers chocolate and a few drops of almond flavoring... its YUMMY!
I get my white BC and add some cocoa to it.
I buy the nestly packs of cocoa and add some milk.
I wish I can tell you the amounts that I use, but I just normally eye-ball it
I tried it this past weekend and I loved it.
HTH!
i use my bc and add a can of bought chocolate frosting, i don't measure it just add until looks good
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