I've not done a lot of cake decorating & I am definitely not at expert at it.
I see some cakes online that people have made & decorated & I'm really jealous of their skills at cake decorating.
I've promised myself that one day in the very near future I'm going to take a class in cake decorating...it would be just one of the best things ever I'm sure!
So, anyway, as I said, I am no way at all that good at decorating cakes & to be honest I am still learning about the different ways of icing/frosting cakes myself.
There are lots & lots of ways to decorate cakes, from a quick dust of icing sugar to thick creamy dollops of buttercream icing. You can also add all sorts of added decorations such as chocolate shavings or sprinkles.
I found this video by Wilton Cake decorating on youtube, and although it is an American video, which means that some products that they mention are sometimes different or harder to get hold of in the UK, it is very helpful for showing you the different types of icing/frosting that there is to use & what they are each best used for.
So take a look:
Their website Wilton.com is also full of really great tips for decorating your cakes and advice on things like icing consistencies and colouring icing.
Hope it helps :)