I love red. Here is a red and yellow party for a one year old boy. I created a balloon arch. I placed a number one balloon as background and in front of the cake table I spelled the little boy's name using balloons.
Balloon arc:
For table centerpieces, I created a 3 balloon centerpiece. One table was red and another yellow.
Centerpieces:
As entrance decoration, I created balloon flowers using red link-o-loon balloons.