you dont know how to use a filter?
for bluer, richer and deeper skies go to your local camera store with your camera and ask for a polarizer that will fit your lens. i recomend buying used ones for dirt cheap. if you have a consumer digital camera that dosnt take any filters just grab an el-cheep-o polarizer and hold it or tape it to your cam..you figure it out.
to use the filter you simply place in front of the lens and shoot. its done!
now there are two types of polarizers and different values...i think. ASK the person at the store!
circular polarizer and linear polarizer i think.
if you dont feel like doing that, you can always pull out some of the blues and reds in photoshop. RICHEN!
oh yeah, if the sky dosnt look like its exploding, dont take a picture of it.
your photo will only work in certain contexts. not in this one though.