More Fun With Computers! 

For kids who have finished the first part of "Fun With Computers," here are some fun things to try next:  
 
Fun With Computers, Course 2


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...and when they've finished that...

Robot Gardener

Build Your Own Flappy Bird
 
Tynker - Under Free play is the Hour Of Code free content.  It's grade level specific, but if the K stuff is too easy, kids could try the higher levels.  The content will probably fill a couple class sessions (if doing K level only).
 
CodeKids - Depending on their reading skills, they could even begin these puzzles.  These are a more advanced version (grades 2-5) of the work kids do in "Fun."

Build a Yeti - from Made With Code

Have fun!