Candy Cane Holiday Wreath- This is probably the easiest idea to have your kids do. The styrofoam ring can be found in the craft section/store, yarn and any decorations you like to add. Wrap the yarn and tie off. Use yarn to tie the decorations on also. No gluing necessary. Instead of yarn you could use strips of wrapping paper and tape it around the ring.
Free Printables for Spring and Some Stationary Too! - Mom 4 Real
Easy make wreath. Use 1 yd of various-colored fabrics (depending on holiday or your decor), cut or torn into 1x6 in strips. Bend hanger into circle, use longer fabric strip to cover hook at top. Tie strips on, alternating colors/prints until wreath is full. Fluff & hang.