Getting Ready For Spring

I am getting some crafts and activities together for Spring.  We are going to do a collage from things gathered outside as soon as the snow melts.  lol.  I have a couple of Spring crafts ready to go. 

But, I need something else.  Does anyone have ideas for a 4 year old boy?  He doesn't have a long attention span..so something quick and easy would be good.

Thanks in Advance.