It's important to note that all these crafts are ideas only. You can adapt any part of any craft idea - make it simpler or more complex - and alter it to use the products you already have on hand.
Help your child to do these steps only if they require it. Let them try to do it by themselves, unless stated. It's easier to show your child by making one too - plus it's fun and your child will enjoy the time you spend together.
contact paper or double sided tape (heaps less messy), or glue
mini Christmas balls or bells
craft wire - long enough to wrap around the cone a few times
any other pieces of Christmas decorations
mini bow or star cut-out for top of tree
paper clips cut in half - to get u-shaped bits of wire
What To Do:
Parent - cover the cone with contact paper (if using) sticky side up - this is the trickiest part. You could also use strips of double sided tape stuck on vertically. Or, just let your child paint glue all over the cone.
Stick on tinsel by wrapping it around the tree - use smaller pieces at a times rather than a big long piece of tinsel.
Wrap around any other decorations, bead garlands or whatever else you can find - attach to tree by using the cut up paper clips - push into styrofoam.
Put a few mini balls onto the piece of craft wire - wrapping wire around itself after each addition - space them out a bit and wrap around tree - pushing the ends into the cone. You can also attach the balls to the tree using the cut-up paper clips - older preschoolers.