Step 1: Base part
make this thing. if you don't know how look at the other pictures
Step 2: Adding on
now put on the green things like shown
Step 3: More add ons
now the orange pieces
Step 4: Even more add ons
and last the rest of the half snow flakes
p.s. modify all you want!
Step 5: Making it explode
to make it explode you can just drop it or you can throw it any way works.