The best icing to use for decorating biscuits?

[Daffodil90]

I made ginger/cinnamon biscuits for the first time today and they came out alright (although I had to keep adding a bit more flour as the dough was a bit sticky for rolling) but wondered how any of you ice your biscuits?

I want to just do lines across (like tinsel on tree shaped biscuits) but don't fancy paying for the really expensive little tubes from the supermarket. I know you can buy empty tubes quite cheaply for squeezing sauces etc but unsure on a recipe to make myself - will the usual icing sugar and water be too liquidy and crack even if I make it quite thick?

Any suggestions gratefully received! Thanks!

Icing sugar and water will work well but I must admit to cheating and using finely cut fondant stuck on with water.

I have also discovered just how easy (if a tad time consuming) the stuff is to make see here so any number of colours/flavours can now be yours to choose from without spending about fifty million pounds on blocks of the stuff from the shop.

A 180g bag of white marshmallows will easily do sufficient icing for dozens of biscuits.

Brilliant stuff - thanks so much!

I think we'll be having some fun :)