To call those hues in direct opposition to each other "complements of each other" is appropriate. Complementary colors bring out the best in each other. When fully saturated complements are brought together, interesting effects are noticeable. This may be a desirable illusion, or a problem if creating visuals that are to be read.
above info. from
http://www.worqx.com/color/complements.htm
These show some complimentary colors (opposite each other on the color wheel) and how they can not only balance each other but make the other appear to vibrate or to pop forward or recede. Red/green are often used to create a 3D effect. I love blue and yellow or purple and orange. My Macaws are a natural example in Caesar ( ) who is red/green and Becky who is blue/yellow (above)
Warhol used this a lot - if you want to produce a Warhol effect painting you use a colour and the next on the colour wheel, plus the complementary colour - interesting collection
I love the blue yellow combo in any degree. You've done really well with the whole month! I've looked at them all but just didn't have all the time I needed to comment!
