As far as I know, the scouters are translucent already, Frieza's scouter was red (Turles' was purple) and Goku didn't have one. In fact, all the scouters were orange on the inside (i'm sure thats impossible in real life). I think it's a bit pointless having different clientside colours for different characters.
If you want to change the colour of your scouter glass then it's an easy thing to do in Photoshop or similar program.