Any tips on how parents can contribute suggestions to their child's school?

For example my son's school in the UK had a 'buddy' program where an older child from a higher grade was teamed off with an younger child from the lower grade year to prevent older kids bullying younger ones- they used to spend a couple of periods every week doing fun activities together.

The teachers also encouraged the class to actively participate in recycle programs where leftover food, plastic bottles or used papers were dumped in respective bins to encourage kids to be aware of the importance of recycling.

I was wondering if there is a way where as a parent I could suggest these methods in my son's school here in US without intruding into the school's policies?