Decorations they can hang themselves are the ones that work — chains, hanging pieces and anything that goes on a wall at their height. The projects here suit a range of ages, and older children can work independently while younger ones need a hand with the assembly.
The week before Yom Tov, once the sukkah is up or nearly up, so there is somewhere to put the finished work straight away. Anything involving glue, paint or clay needs drying time — start those a few days earlier rather than the afternoon before.
Not all of them, and that is worth knowing in advance. Anything paper should hang on a sheltered wall or come inside if rain is coming. Sealing a finished craft with a coat of clear varnish or mod podge buys it a great deal of weather resistance.
Each project lists its own materials, and most call for things already in the house — card, glue, paint, string. The one thing worth buying in advance is a roll of clear contact paper or a bottle of mod podge, which makes almost any paper craft last the week.