The best and definitely the easiest method that I\'ve found so far (and I recently used it in the Iron Painter comp), is to;
Coat a blister pack or any other clear plastic with Araldite Clear - (Really mix the Araldite up to get lots of bubbles in it - also, when spreading it onto the plastic, spread it all in the same direction so you get little ridges) - and let it set.
When set, you can cut the icicle shapes out of the plastic - make sure you cut in the same direction as the ridges, so to add to the illusion of water frozen.
Stick your icicle shape(s) to wherever they are required and let the glue holding them set.
Lastly, mix a little more Araldite and add it to the icicles until your desired shape is achieved.
It\'s really quick, really easy and looks really convincing - much better than trying to dribble glue down fishing line (this tends to end up blobby and unrealistic).