I made color value paper charts with my kids..
black poster board
Grouped kids together into small groups and assigned them a color,
within the groups the kids chose liter or darker colors.
Than had them peruse magazines ( National geographics mainly) to rummage
through for their assigned colors to cut out and than tear into small
I gave them all a 3x10 strip to glue ( gluestick) their colors on, as
well as they could by light to dark range.
Those strips where than glues upon a black , again by value..
This made a wonderful Poster of color values, we made an apple mosaic of
the chips and glued it over the strips, sort of gave the poster
I found this a good 6th grade project, although this can be done easily
with younger kids, 6th graders just took it further, after that to make
mosaics where a snap..:)