Garden Flag

I am the garden mom for my daughter'c classroom.  We have done some weeding and planting and things are really starting to look beautiful.  The only thing that is missing is a sign identifying their garden.  I have been thinking about painting a cute rock, but I really like this idea from Random Thought of a Supermom:

Anyone have any other suggestions?  I thought a chalkboard painted rock would be fun, but I am pretty sure the rain would ruin that idea, but maybe not!

And then of course I find this:

And a banner seems like so much more fun than a flag!   I could use the same ribbon letter idea from Supermom, but spell out the teacher's entire name!

Of I could stick with a rock.