Here are some COLOR unit ideas for the color RED:

BOOKS

"Mary Wore Her Red Dress" by Merle Peek

"Is It Red?  Is it Yellow?  Is it Blue?"  by Tana Hoban

"Who Said Red?" by Mary Serfozo

"Finding Red, Finding Yellow" by Betsy Imershein

"The Red Poppy" by Irmgard Lucht

"Red is Best" by Kathy Stinson

"The Little Mouse, The Red Ripe Strawberry, and The Big Hungry Bear"
       by Don and Audrey Wood

"Mystery of the Missing Red Mitten"

"Ladybug, Ladybug, Where Are You?

"Clifford the Big Red Dog" (and all the other Clifford books, too)

songs

Little Gray Mousie---this one goes with the Ripe Strawberry Book)
  (Tune: Short'nin Bread")

Little gray mousie loves strawberry, strawberry.
Little gray mousie sees one that's ripe.
Little gray mousie loves strawberry, strawberry.
Little gray mousie has quite a fright.

Little gray mousie loves strawberry, strawberry.
Little gray mousie gives half to me.
Little gray mousie loves strawberry, strawberry.
Little gray mousie rests dreamily.

RED 
(Tune: Someones in the Kitchen with Dinah)

Red is the color of Apples.
Red is the color of Cherries, too.
Red is the color of a firetruck.
I like red don't you?

"Little Red Caboose"

"Riding Up and Down in My Little Red Wagon"


ACTIVITIES
Cut out and laminate 5 or 6 strawberry shapes from red paper.  Cut each into
2  piece puzzles using different curves and angles...and invite the children
to put together the red strawberry HALVES.

Bring out the firefigher dramatic play equipment and all the RED helmets...

Place plastic firefighter people and plastic firetrucks in sand in the
sensory table...

Bring in red apples and let the children place them in order from smallest
to largest....

ART

place various shade of red paint at the easels 

Glue a RED thing collage on RED paper, of course.  Invite children to bring
RED things from home to glue on to a RED collage...  you'll need to have some
things available too like, red fabric scraps, red yarn, red buttons, red
paper, red tissue paper, red cotton balls, red milk jug caps, red confetti.

LANGUAGE

Have the children assist you in making a RED thing list (words and/or
drawings) on easel sized paper.....ladybugs, apples, cherries, shirts, socks,
etc.....hang it on the wall and add to it as they come up with another
idea....you may end up needing LOTS of pieces of paper as their imaginations
go wild with RED!!  :-)

Here's a spelling song I got from another loop:

RED
(Tune: Are You Sleeping?)

R-E-D
R-E-D
That spells red
That spells red
Apples are that color
Strawberries are that color
R-E-D
R-E-D
(have the children substitute other things for apples and strawberries and
sing again and again and again!)  

"Way Up High in the Apple Tree" action poem