Next to dig pit! Kids love to build and create things, so having an outdoor block area made of sticks, branches, and rocks is ingenious. It is taking advantage of the outdoors around us and using it to create a fun and academic center for children. It is very economical with the "blocks" being easily replaced, and there is no worry about ruining them if it rains.
You could use photos of the children in your centre and cut them out and glue them either to toilet paper rolls or to blocks. Having each others pictures in the block area would be a great way to add dramatic play to the block area. You could also incorporate teaching empathy and understanding with these.