Craneflies are true flies and in the same family as midges, Dipthera. Here are three patterns for the larva:
tying Walt's Worm a step-by-step
Charlie's Fly Box
Charlie's FlyBox - Colorado's Best FlyShop and online Fly Tying Tutorials
Tie a Vladi Condum Worm using a white latex.
From reading about adult cranefly patterns, the best dry pattern seems to be "Brun's Tipula" by Norwegian Andre Brun. It was in FFM in 2002. It is a relatively easy fly to tie and looks fantastic. I would use the correct brown color of foam rather than coloring the foam.
Brun's Tipula - Norwegian Trut Bum Andre Brun ahows how to tie the polychenille extended body cranefly with its shivering rubber legs. This fly appeared first time in Flyfisherman magazine feb. 2002, and is still one of his all time favourite for bro