I just gave this same answer to the lady looking for help with drawing a honda goldwing. I would give "color flow" a try. You can use a drawing you have or get it from "Clip Art" off your computer. Put a piece of wax paper over the item you want to copy and just trace the drawing with stiff color flow and then fill it in with thinned down color flow. The technique is very simple and you don't have to know how to draw or anything. Copying is all you have to do really. I love it! 
It dries very hard and you just place it on your cake.
Another thing that works well is cookie cutters. Use them to imprint a design on your cake, then fill it in with frosting. This is not a very good cake, but it shows what I mean. The cars & trucks on the side were imprinted with one of those cookie stamps and I just filled it in w/frosting then smoothed it out with a small brush.
my photos have a pic of a 56 Chevy done with color flow
By the way...welcome to CC and our addiction!! 
OOOOOOOOHHHHHHH.......... ADDICTION is so right! 
I just can't get enough of this site and looking at everyones wonderful work. I can actually spend all day on here. 
I am learning so much through everyone though, so I feel it is worth it. (even if my hubub never gets to use the computer unless I'm sleeping)
Tabby
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