To make a transparent color, just put the last set of numbers lower then 255.
for example, If i wanted to make a transparent red, I would put the color as:
255 0 0 225
R G B Trans
First number is the Red, the second number is the amount of Green, the third number is the amount of Blue, and the fourth number is the transparency. (255 would be solid)
If you want to make it work, Just find the file called ColorSet in Blockland/config/server And rename it something else. Then rename the file you made for the color set and re-name it ColorSet
Hope this helps :)