When we went to France in the summer my daughter began sneaking pine cones into her bag, which she then insisted on keeping and bringing back home! I wanted to help her do something interesting with them but thought it unlikely that they'd last until Christmas when we could spray them gold or silver and hang them as decorations. So we sat down together and painted them in other bright colours and created a mobile for her bedroom!
We can also add to the mobile as it's just two sticks tied together with string, and the hanging items looped over. As you can see we've already added a salt dough heart that she made - it just needed rearranging a bit to keep the balance. We used quite rough brown string to keep it looking rustic and natural. Plus it makes life easier if the intentional look is a bit rough around the edges!