Here's a tip:
Consider the fabrics you are using in your quilt and stand back 8 ft. or more from your design wall and observe which of your colors is standing out the most to you. These fabrics will also pop out in your quilt to you. Is it that crazy shade of neon orange? You can tell which ones will overshadow the others this way! Use those colors very carefully to highlight areas of your quilt that will stand out stronger than any other color!
Let's look at this pic again. The 3rd row from the bottom has a background fabric that is really popping out!! Do you see it? Yes! You're right! It's that cheddar yellow! And straight above it near the top I used a similar shade. Also notice, because of its vibrating strength, I only used 2 blocks like that in the quilt. Any more of that color would knock it off balance!
Let's look again to the upper right of that same block and notice the light blue background one! Wow! Is that a powerful light blue or what? You cannot just have too many of those in your quilt. Also, the very powerful lime greens I used could only be in there twice. Do you see those 2? See how powerfully they exhibit?
Another technique I used was to take that same background cheddar fabric and use it as a center square for another block. It's located straight up near the top from that block. Repeating the same fabric in another section of the block is a great trick for giving it a 'coordinated' look. You might want to do the same with certain colors and fabrics you want emphasized in your quilt!
Sure hope this helps you in your fabric/color choices. Taking a pic of the fabs on the design wall will help when seeing them on the comp screen for their strength/vibration. Hope your quilt will be radiating beautifully!! That's all for now....until the next tut!!
p.s. About that light blue fabric ~~ it is mixed with a white color. If you really want intense shades, consider buying a print that is mixed with a white or black and from a distance, that print will really stand out!!!