I found these foam blocks at Target about a year ago. I keep hoping they will resurface--but I haven't seen them yet! They make for a fun sight-word-spelling word game!
The students pick a block--read it-write it-stack it! They want to have the tower get as high as possible!
This could be done independently, in small groups, and even whole group with bigger blocks. I hope Target sells these again--and soon--I have lots of ideas for these blocks!
In the meantime--you can get lots of other ideas at 4th Grade Frolics!