I work for a medium size firm and some of the ways we encourage wellness and innovation are:
-Company walks at 3pm, we all get up and go work a walk around the building each day.
-Every employee is allowed to spend time out of their week to research anything they want. It is only an hour a week but it has become a good time for employees to look up interesting articles, projects and tutorials and share them with their coworkers.
-Team brainstorms: At a minimum of once a month the company as a whole gets together to brainstorm ideas from everything from a project specifics, to design techniques, to how we can improve our company. These are a great way to encourage new ideas and collaborate as a team.